js中封装兼容代码

Posted 2021-06-29 嘴巴嘟嘟

//foreach的兼容代码
if (!Array.prototype.forEach) {

    Array.prototype.forEach = function(callback, thisArg) {

        var T, k;

        if (this == null) {
            throw new TypeError(' this is null or not defined');
        }

        // 1. Let O be the result of calling toObject() passing the
        // |this| value as the argument.
        var O = Object(this);

        // 2. Let lenValue be the result of calling the Get() internal
        // method of O with the argument "length".
        // 3. Let len be toUint32(lenValue).
        var len = O.length >>> 0;

        // 4. If isCallable(callback) is false, throw a TypeError exception. 
        // See: http://es5.github.com/#x9.11
        if (typeof callback !== "function") {
            throw new TypeError(callback + ' is not a function');
        }

        // 5. If thisArg was supplied, let T be thisArg; else let
        // T be undefined.
        if (arguments.length > 1) {
            T = thisArg;
        }

        // 6. Let k be 0
        k = 0;

        // 7. Repeat, while k < len
        while (k < len) {

            var kValue;

            // a. Let Pk be ToString(k).
            //    This is implicit for LHS operands of the in operator
            // b. Let kPresent be the result of calling the HasProperty
            //    internal method of O with argument Pk.
            //    This step can be combined with c
            // c. If kPresent is true, then
            if (k in O) {

                // i. Let kValue be the result of calling the Get internal
                // method of O with argument Pk.
                kValue = O[k];

                // ii. Call the Call internal method of callback with T as
                // the this value and argument list containing kValue, k, and O.
                callback.call(T, kValue, k, O);
            }
            // d. Increase k by 1.
            k++;
        }
        // 8. return undefined
    };
}


/**
 * Created by Administrator on 
 */
//格式化日期的代码

//根据id获取元素的代码

//innerText和textContent的兼容

//获取第一个子元素的兼容

//获取最后一个子元素的兼容

/**
 * Created by Administrator on 
 */

/**
 * 格式化日期
 * @param dt 日期对象
 * @returns {string} 返回值是格式化的字符串日期
 */
function getDates(dt) {
    var str = "";//存储时间的字符串
    //获取年
    var year = dt.getFullYear();
    //获取月
    var month = dt.getMonth() + 1;
    //获取日
    var day = dt.getDate();
    //获取小时
    var hour = dt.getHours();
    //获取分钟
    var min = dt.getMinutes();
    //获取秒
    var sec = dt.getSeconds();
    month = month < 10 ? "0" + month : month;
    day = day < 10 ? "0" + day : day;
    hour = hour < 10 ? "0" + hour : hour;
    min = min < 10 ? "0" + min : min;
    sec = sec < 10 ? "0" + sec : sec;
    str = year + "年" + month + "月" + day + "日 " + hour + ":" + min + ":" + sec;
    return str;
}
/**
 * 获取指定标签对象
 * @param id 标签的id属性值
 * @returns {Element}根据id属性值返回指定标签对象
 */
function my$(id) {
    return document.getElementById(id);
}
/**
 * 设置元素的文本内容
 * @param element 任意元素
 * @param text 任意文本内容
 */
function setInnerText(element, text) {
    if (typeof(element.textContent) == "undefined") {
        element.innerText = text;
    } else {
        element.textContent = text;
    }
}
/**
 * 获取元素的文本内容
 * @param element 任意元素
 * @returns {*} 任意元素中的文本内容
 */
function getInnerText(element) {
    if (typeof(element.textContent) == "undefined") {
        return element.innerText;
    } else {
        return element.textContent;
    }
}
/**
 * 获取父级元素中的第一个子元素
 * @param element 父级元素
 * @returns {*} 父级元素中的子级元素
 */
function getFirstElement(element) {
    if (element.firstElementChild) {
        return element.firstElementChild;
    } else {
        var node = element.firstChild;
        while (node && node.nodeType != 1) {
            node = node.nextSibling;
        }
        return node;
    }
}
/**
 * 获取父级元素中的最后一个子元素
 * @param element 父级元素
 * @returns {*} 最后一个子元素
 */
function getLastElement(element) {
    if (element.lastElementChild) {
        return element.lastElementChild;
    } else {
        var node = element.lastChild;
        while (node && node.nodeType != 1) {
            node = node.previousSibling;
        }
        return node;
    }
}
/**
 * 获取某个元素的前一个兄弟元素
 * @param element 某个元素
 * @returns {*} 前一个兄弟元素
 */
function getPreviousElement(element) {
    if (element.previousElementSibling) {
        return element.previousElementSibling
    } else {
        var node = element.previousSibling;
        while (node && node.nodeType != 1) {
            node = node.previousSibling;
        }
        return node;
    }
}
/**
 * 获取某个元素的后一个兄弟元素
 * @param element 某个元素
 * @returns {*} 后一个兄弟元素
 */
function getNextElement(element) {
    if (element.nextElementSibling) {
        return element.nextElementSibling
    } else {
        var node = element.nextSibling;
        while (node && node.nodeType != 1) {
            node = node.nextSibling;
        }
        return node;
    }
}
/**
 * 获取某个元素的所有兄弟元素
 * @param element 某个元素
 * @returns {Array} 兄弟元素
 */
function getSiblings(element) {
    if (!element)return;
    var elements = [];
    var ele = element.previousSibling;
    while (ele) {
        if (ele.nodeType === 1) {
            elements.push(ele);
        }
        ele = ele.previousSibling;
    }
    ele = element.nextSibling;
    while (ele) {
        if (ele.nodeType === 1) {
            elements.push(ele);

        }
        ele = ele.nextSibling;
    }
    return elements;
}
/**
 * 返回当前浏览器是什么类型的浏览器
 */
function userBrowser(){
    var browserName=navigator.userAgent.toLowerCase();
    if(/msie/i.test(browserName) && !/opera/.test(browserName)){
        console.log("IE");
    }else if(/firefox/i.test(browserName)){
        console.log("Firefox");
    }else if(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)){
        console.log("Chrome");
    }else if(/opera/i.test(browserName)){
        console.log("Opera");
    }else if(/webkit/i.test(browserName) &&!(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName))){
        console.log("Safari");
    }else{
        console.log("不知道什么鬼!");
    }
}



//为任意一个元素绑定事件:元素,事件类型,事件处理函数
function addEventListener(element,type,fn) {
    if(element.addEventListener){
        //支持
        element.addEventListener(type,fn,false);
    }else if(element.attachEvent){
        element.attachEvent("on"+type,fn);
    }else{
        element["on"+type]=fn;
    }
}
//为任意的一个元素解绑某个事件:元素,事件类型,事件处理函数
function removeEventListener(element,type,fn) {
    if(element.removeEventListener){
        element.removeEventListener(type,fn,false);
    }else if(element.detachEvent){
        element.detachEvent("on"+type,fn);
    }else{
        element["on"+type]=null;
    }
}

/**
 * 获取的是页面向上或者向左卷曲出去的距离的值,返回的是对象
 * @returns {{top: (Number|number), left: (Number|number)}}
 */
function getScroll() {
    return {
        top: window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop || 0,
        left: window.pageXOffset || document.body.scrollLeft || document.documentElement.scrollLeft||0
    };
}