为Zepto添加Slide动画效果
Posted 最骚的就是你
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一.缘由
公司的移动端项目，采用zepto为主要框架，但是zepto毕竟是精简版的jquery，体积小了，功能自然没有这么强大，特别是动画和选择器这两块，需要我们自己去拓展。
在项目开发过程中，很多页面过渡需要用到动画，简单的show/hide过渡太生硬，对用户不友好，并且移动端大多都是采用slide效果，此文主要是为zepto拓展slide动画。
二.发现
从zepto的在线文档上可以发现一个发布在github上的动画模块，但是缺少slide效果，度娘上找了找，相关的极少，只发现了一个slideDown的例子，所以我们就照着这个例子写了几个常用的slide动画。
三.行动
首先，我们把动画方向分为上下滑动和左右滑动，滑动形式分为元素自身的伸缩和相对位移
1.左右slide
这应该是最常用的一个效果
贴上代码：注释部分二选一， slideLeft 和 slideRight 的滑动形式必须设为一致，不然无法工作
$.fn.slideLeft = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ left: -width }, speed, null, callback);
};
$.fn.slideRight = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width() === 0 ? $(window).width() : this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// width: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: width }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
left: -width,
position: position,
visibility: \'visible\',
overflow: \'auto\',
}).animate({ left: 0 }, speed, null, callback);
};
$.fn.slideLeft = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ left: -width }, speed, null, callback);
};
$.fn.slideRight = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width() === 0 ? $(window).width() : this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// width: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: width }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
left: -width,
position: position,
visibility: \'visible\',
overflow: \'auto\',
}).animate({ left: 0 }, speed, null, callback);
};
左右位移效果图：
左右伸缩效果图：
2.上下slide
贴上代码：注释部分二选一， slideUp 和 slideDown 的滑动形式必须设为一致，不然无法工作
$.fn.slideDown = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素高度
var height = this.height() === 0 ? $(window).height() : this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'auto\',
// height: 0
//}).animate({ height: height }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: -height,
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: 0 }, speed, null, callback);
};
$.fn.slideUp = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'auto\'
});
//获取元素高度
var height = this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'hidden\',
// height: height
//}).animate({ height: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: -height }, speed, null, callback);
};
$.fn.slideDown = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素高度
var height = this.height() === 0 ? $(window).height() : this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'auto\',
// height: 0
//}).animate({ height: height }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: -height,
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: 0 }, speed, null, callback);
};
$.fn.slideUp = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'auto\'
});
//获取元素高度
var height = this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'hidden\',
// height: height
//}).animate({ height: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: -height }, speed, null, callback);
};
上下位移效果图：
上下伸缩效果图：
四.结束
这样，我们在项目中就能愉快的使用动画了。
顺便附上整个动画模块，但在这之前必须先添加上animate模块，因为zepto本身是不具有animate事件的，许多模块都是单独分出去的，可以参考这里，代码我们可以从github中的animate模块复制进去。
//animate模块
; (function ($, undefined) {
var prefix = \'\', eventPrefix,
vendors = { Webkit: \'webkit\', Moz: \'\', O: \'o\' },
testEl = document.createElement(\'div\'),
supportedTransforms = /^((translate|rotate|scale)(X|Y|Z|3d)?|matrix(3d)?|perspective|skew(X|Y)?)$/i,
transform,
transitionProperty, transitionDuration, transitionTiming, transitionDelay,
animationName, animationDuration, animationTiming, animationDelay,
cssReset = {}
function dasherize(str) { return str.replace(/([A-Z])/g, \'-$1\').toLowerCase() }
function normalizeEvent(name) { return eventPrefix ? eventPrefix + name : name.toLowerCase() }
if (testEl.style.transform === undefined) $.each(vendors, function (vendor, event) {
if (testEl.style[vendor + \'TransitionProperty\'] !== undefined) {
prefix = \'-\' + vendor.toLowerCase() + \'-\'
eventPrefix = event
return false
}
})
transform = prefix + \'transform\'
cssReset[transitionProperty = prefix + \'transition-property\'] =
cssReset[transitionDuration = prefix + \'transition-duration\'] =
cssReset[transitionDelay = prefix + \'transition-delay\'] =
cssReset[transitionTiming = prefix + \'transition-timing-function\'] =
cssReset[animationName = prefix + \'animation-name\'] =
cssReset[animationDuration = prefix + \'animation-duration\'] =
cssReset[animationDelay = prefix + \'animation-delay\'] =
cssReset[animationTiming = prefix + \'animation-timing-function\'] = \'\'
$.fx = {
off: (eventPrefix === undefined && testEl.style.transitionProperty === undefined),
speeds: { _default: 400, fast: 200, slow: 600 },
cssPrefix: prefix,
transitionEnd: normalizeEvent(\'TransitionEnd\'),
animationEnd: normalizeEvent(\'AnimationEnd\')
}
$.fn.animate = function (properties, duration, ease, callback, delay) {
if ($.isFunction(duration))
callback = duration, ease = undefined, duration = undefined
if ($.isFunction(ease))
callback = ease, ease = undefined
if ($.isPlainObject(duration))
ease = duration.easing, callback = duration.complete, delay = duration.delay, duration = duration.duration
if (duration) duration = (typeof duration == \'number\' ? duration :
($.fx.speeds[duration] || $.fx.speeds._default)) / 1000
if (delay) delay = parseFloat(delay) / 1000
return this.anim(properties, duration, ease, callback, delay)
}
$.fn.anim = function (properties, duration, ease, callback, delay) {
var key, cssValues = {}, cssProperties, transforms = \'\',
that = this, wrappedCallback, endEvent = $.fx.transitionEnd,
fired = false
if (duration === undefined) duration = $.fx.speeds._default / 1000
if (delay === undefined) delay = 0
if ($.fx.off) duration = 0
if (typeof properties == \'string\') {
// keyframe animation
cssValues[animationName] = properties
cssValues[animationDuration] = duration + \'s\'
cssValues[animationDelay] = delay + \'s\'
cssValues[animationTiming] = (ease || \'linear\')
endEvent = $.fx.animationEnd
} else {
cssProperties = []
// CSS transitions
for (key in properties)
if (supportedTransforms.test(key)) transforms += key + \'(\' + properties[key] + \') \'
else cssValues[key] = properties[key], cssProperties.push(dasherize(key))
if (transforms) cssValues[transform] = transforms, cssProperties.push(transform)
if (duration > 0 && typeof properties === \'object\') {
cssValues[transitionProperty] = cssProperties.join(\', \')
cssValues[transitionDuration] = duration + \'s\'
cssValues[transitionDelay] = delay + \'s\'
cssValues[transitionTiming] = (ease || \'linear\')
}
}
wrappedCallback = function (event) {
if (typeof event !== \'undefined\') {
if (event.target !== event.currentTarget) return // makes sure the event didn\'t bubble from "below"
$(event.target).unbind(endEvent, wrappedCallback)
} else
$(this).unbind(endEvent, wrappedCallback) // triggered by setTimeout
fired = true
$(this).css(cssReset)
callback && callback.call(this)
}
if (duration > 0) {
this.bind(endEvent, wrappedCallback)
// transitionEnd is not always firing on older android phones
// so make sure it gets fired
setTimeout(function () {
if (fired) return
wrappedCallback.call(that)
}, ((duration + delay) * 1000) + 25)
}
// trigger page reflow so new elements can animate
this.size() && this.get(0).clientLeft
this.css(cssValues)
if (duration <= 0) setTimeout(function () {
that.each(function () { wrappedCallback.call(this) })
}, 0)
return this
}
testEl = null
})(Zepto)
//动画效果模块
; (function ($, undefined) {
var document = window.document, docElem = document.documentElement,
origShow = $.fn.show, origHide = $.fn.hide, origToggle = $.fn.toggle
function anim(el, speed, opacity, scale, callback) {
if (typeof speed == \'function\' && !callback) callback = speed, speed = undefined
var props = { opacity: opacity }
if (scale) {
props.scale = scale
el.css($.fx.cssPrefix + \'transform-origin\', \'0 0\')
}
return el.animate(props, speed, null, callback);
}
function hide(el, speed, scale, callback) {
return anim(el, speed, 0, scale, function () {
origHide.call($(this))
callback && callback.call(this)
})
}
$.fn.show = function (speed, callback) {
origShow.call(this)
//不是很理解作者的想法，如果这里继续执行下去，所有调用zepto原生show事件的元素，都会被这个事件覆盖，并且透明度都为被设为1...
if (speed === undefined) return origShow.call(this) // 原版为：if (speed === undefined) speed = 0
else this.css(\'opacity\', 0)
return anim(this, speed, 1, \'1,1\', callback)
}
$.fn.hide = function (speed, callback) {
if (speed === undefined) return origHide.call(this)
else return hide(this, speed, \'0,0\', callback)
}
$.fn.toggle = function (speed, callback) {
if (speed === undefined || typeof speed == \'boolean\')
return origToggle.call(this, speed)
else return this.each(function () {
var el = $(this)
el[el.css(\'display\') == \'none\' ? \'show\' : \'hide\'](speed, callback)
})
}
$.fn.fadeTo = function (speed, opacity, callback) {
return anim(this, speed, opacity, null, callback)
}
$.fn.fadeIn = function (speed, callback) {
var target = this.css(\'opacity\')
if (target > 0) this.css(\'opacity\', 0)
else target = 1
return origShow.call(this).fadeTo(speed, target, callback)
}
$.fn.fadeOut = function (speed, callback) {
return hide(this, speed, null, callback)
}
$.fn.fadeToggle = function (speed, callback) {
return this.each(function () {
var el = $(this)
el[
(el.css(\'opacity\') == 0 || el.css(\'display\') == \'none\') ? \'fadeIn\' : \'fadeOut\'
](speed, callback)
})
}
$.fn.slideDown = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素高度
var height = this.height() === 0 ? $(window).height() : this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'auto\',
// height: 0
//}).animate({ height: height }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: -height,
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: 0 }, speed, null, callback);
};
$.fn.slideUp = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'auto\'
});
//获取元素高度
var height = this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'hidden\',
// height: height
//}).animate({ height: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: -height }, speed, null, callback);
};
$.fn.slideLeft = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ left: -width }, speed, null, callback);
};
$.fn.slideRight = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width() === 0 ? $(window).width() : this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// width: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: width }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
left: -width,
position: position,
visibility: \'visible\',
overflow: \'auto\',
}).animate({ left: 0 }, speed, null, callback);
};
})(Zepto)
//animate模块
; (function ($, undefined) {
var prefix = \'\', eventPrefix,
vendors = { Webkit: \'webkit\', Moz: \'\', O: \'o\' },
testEl = document.createElement(\'div\'),
supportedTransforms = /^((translate|rotate|scale)(X|Y|Z|3d)?|matrix(3d)?|perspective|skew(X|Y)?)$/i,
transform,
transitionProperty, transitionDuration, transitionTiming, transitionDelay,
animationName, animationDuration, animationTiming, animationDelay,
cssReset = {}
function dasherize(str) { return str.replace(/([A-Z])/g, \'-$1\').toLowerCase() }
function normalizeEvent(name) { return eventPrefix ? eventPrefix + name : name.toLowerCase() }
if (testEl.style.transform === undefined) $.each(vendors, function (vendor, event) {
if (testEl.style[vendor + \'TransitionProperty\'] !== undefined) {
prefix = \'-\' + vendor.toLowerCase() + \'-\'
eventPrefix = event
return false
}
})
transform = prefix + \'transform\'
cssReset[transitionProperty = prefix + \'transition-property\'] =
cssReset[transitionDuration = prefix + \'transition-duration\'] =
cssReset[transitionDelay = prefix + \'transition-delay\'] =
cssReset[transitionTiming = prefix + \'transition-timing-function\'] =
cssReset[animationName = prefix + \'animation-name\'] =
cssReset[animationDuration = prefix + \'animation-duration\'] =
cssReset[animationDelay = prefix + \'animation-delay\'] =
cssReset[animationTiming = prefix + \'animation-timing-function\'] = \'\'
$.fx = {
off: (eventPrefix === undefined && testEl.style.transitionProperty === undefined),
speeds: { _default: 400, fast: 200, slow: 600 },
cssPrefix: prefix,
transitionEnd: normalizeEvent(\'TransitionEnd\'),
animationEnd: normalizeEvent(\'AnimationEnd\')
}
$.fn.animate = function (properties, duration, ease, callback, delay) {
if ($.isFunction(duration))
callback = duration, ease = undefined, duration = undefined
if ($.isFunction(ease))
callback = ease, ease = undefined
if ($.isPlainObject(duration))
ease = duration.easing, callback = duration.complete, delay = duration.delay, duration = duration.duration
if (duration) duration = (typeof duration == \'number\' ? duration :
($.fx.speeds[duration] || $.fx.speeds._default)) / 1000
if (delay) delay = parseFloat(delay) / 1000
return this.anim(properties, duration, ease, callback, delay)
}
$.fn.anim = function (properties, duration, ease, callback, delay) {
var key, cssValues = {}, cssProperties, transforms = \'\',
that = this, wrappedCallback, endEvent = $.fx.transitionEnd,
fired = false
if (duration === undefined) duration = $.fx.speeds._default / 1000
if (delay === undefined) delay = 0
if ($.fx.off) duration = 0
if (typeof properties == \'string\') {
// keyframe animation
cssValues[animationName] = properties
cssValues[animationDuration] = duration + \'s\'
cssValues[animationDelay] = delay + \'s\'
cssValues[animationTiming] = (ease || \'linear\')
endEvent = $.fx.animationEnd
} else {
cssProperties = []
// CSS transitions
for (key in properties)
if (supportedTransforms.test(key)) transforms += key + \'(\' + properties[key] + \') \'
else cssValues[key] = properties[key], cssProperties.push(dasherize(key))
if (transforms) cssValues[transform] = transforms, cssProperties.push(transform)
if (duration > 0 && typeof properties === \'object\') {
cssValues[transitionProperty] = cssProperties.join(\', \')
cssValues[transitionDuration] = duration + \'s\'
cssValues[transitionDelay] = delay + \'s\'
cssValues[transitionTiming] = (ease || \'linear\')
}
}
wrappedCallback = function (event) {
if (typeof event !== \'undefined\') {
if (event.target !== event.currentTarget) return // makes sure the event didn\'t bubble from "below"
$(event.target).unbind(endEvent, wrappedCallback)
} else
$(this).unbind(endEvent, wrappedCallback) // triggered by setTimeout
fired = true
$(this).css(cssReset)
callback && callback.call(this)
}
if (duration > 0) {
this.bind(endEvent, wrappedCallback)
// transitionEnd is not always firing on older Android phones
// so make sure it gets fired
setTimeout(function () {
if (fired) return
wrappedCallback.call(that)
}, ((duration + delay) * 1000) + 25)
}
// trigger page reflow so new elements can animate
this.size() && this.get(0).clientLeft
this.css(cssValues)
if (duration <= 0) setTimeout(function () {
that.each(function () { wrappedCallback.call(this) })
}, 0)
return this
}
testEl = null
})(Zepto)
//动画效果模块
; (function ($, undefined) {
var document = window.document, docElem = document.documentElement,
origShow = $.fn.show, origHide = $.fn.hide, origToggle = $.fn.toggle
function anim(el, speed, opacity, scale, callback) {
if (typeof speed == \'function\' && !callback) callback = speed, speed = undefined
var props = { opacity: opacity }
if (scale) {
props.scale = scale
el.css($.fx.cssPrefix + \'transform-origin\', \'0 0\')
}
return el.animate(props, speed, null, callback);
}
function hide(el, speed, scale, callback) {
return anim(el, speed, 0, scale, function () {
origHide.call($(this))
callback && callback.call(this)
})
}
$.fn.show = function (speed, callback) {
origShow.call(this)
//不是很理解作者的想法，如果这里继续执行下去，所有调用zepto原生show事件的元素，都会被这个事件覆盖，并且透明度都为被设为1...
if (speed === undefined) return origShow.call(this) // 原版为：if (speed === undefined) speed = 0
else this.css(\'opacity\', 0)
return anim(this, speed, 1, \'1,1\', callback)
}
$.fn.hide = function (speed, callback) {
if (speed === undefined) return origHide.call(this)
else return hide(this, speed, \'0,0\', callback)
}
$.fn.toggle = function (speed, callback) {
if (speed === undefined || typeof speed == \'boolean\')
return origToggle.call(this, speed)
else return this.each(function () {
var el = $(this)
el[el.css(\'display\') == \'none\' ? \'show\' : \'hide\'](speed, callback)
})
}
$.fn.fadeTo = function (speed, opacity, callback) {
return anim(this, speed, opacity, null, callback)
}
$.fn.fadeIn = function (speed, callback) {
var target = this.css(\'opacity\')
if (target > 0) this.css(\'opacity\', 0)
else target = 1
return origShow.call(this).fadeTo(speed, target, callback)
}
$.fn.fadeOut = function (speed, callback) {
return hide(this, speed, null, callback)
}
$.fn.fadeToggle = function (speed, callback) {
return this.each(function () {
var el = $(this)
el[
(el.css(\'opacity\') == 0 || el.css(\'display\') == \'none\') ? \'fadeIn\' : \'fadeOut\'
](speed, callback)
})
}
$.fn.slideDown = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素高度
var height = this.height() === 0 ? $(window).height() : this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'auto\',
// height: 0
//}).animate({ height: height }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: -height,
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: 0 }, speed, null, callback);
};
$.fn.slideUp = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'auto\'
});
//获取元素高度
var height = this.height();
//-------通过伸缩元素高度实现动画-------
//return this.css({
// position: position,
// visibility: \'visible\',
// overflow: \'hidden\',
// height: height
//}).animate({ height: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
left: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ top: -height }, speed, null, callback);
};
$.fn.slideLeft = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: 0 }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
position: position,
visibility: \'visible\',
overflow: \'auto\'
}).animate({ left: -width }, speed, null, callback);
};
$.fn.slideRight = function (speed, callback) {
//获取元素position
var position = this.css(\'position\');
this.show().css({
position: \'absolute\',
visibility: \'hidden\'
});
//获取元素宽度
var width = this.width() === 0 ? $(window).width() : this.width();
//-------通过伸缩元素宽度实现动画-------
//return this.css({
// top: 0,
// width: 0,
// position: position,
// visibility: \'visible\',
// overflow: \'auto\'
//}).animate({ width: width }, speed, null, callback);
//-------通过移动元素相对位置实现动画-------
return this.css({
top: 0,
left: -width,
position: position,
visibility: \'visible\',
overflow: \'auto\',
}).animate({ left: 0 }, speed, null, callback);
};
})(Zepto)
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