html HTML / JQUERY：将窗口宽度特定类设置为body标签。用于向旧版浏览器添加媒体查询支持或添加宽度指定
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<html>
<head>
<style>
// hide body from view
body {opacity: 0}
</style>
</head>
<body
class=""
data-small="480"
data-medium="600"
data-large="960"
>
<h1>Hello World</h1>
<div class="debug"></div>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
(function($,sr){
// debouncing function from John Hann
// http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
var debounce = function (func, threshold, execAsap) {
var timeout;
return function debounced () {
var obj = this, args = arguments;
function delayed () {
if (!execAsap)
func.apply(obj, args);
timeout = null;
};
if (timeout)
clearTimeout(timeout);
else if (execAsap)
func.apply(obj, args);
timeout = setTimeout(delayed, threshold || 100);
};
}
// smartresize
jQuery.fn[sr] = function(fn){ return fn ? this.bind('resize', debounce(fn)) : this.trigger(sr); };
})(jQuery,'smartresize');
function debug(target,msg) {
//code
if (target == 'console') {
// write to browser console
console.log(msg);
return;
}
else if (target == 'body') {
// copy msg to debug
$('div.debug').html(msg);
return;
}
else if (target == 'alert') {
// show msg in popup
alert(msg);
return;
}
else {
return;
}
}
function iniPage() {
//execute on load and AFTER a resize.
$('body').css({opacity: 0});
var window_width = $(window).width();
var small = $('body').attr('data-small');
var medium = $('body').attr('data-medium');
var large = $('body').attr('data-large');
if (window_width <= small) {
//small device
var body_class = 'small';
}
else if (window_width > small && window_width <= large) {
//medium device
var body_class = 'medium';
}
else if (window_width > large) {
//large device
var body_class = 'large';
}
$('body').removeClass('small medium large').addClass(body_class);
// Show body
$('body').animate({opacity: 1}, 3000);
var msg = 'function iniPage() executed. Body class is ' + body_class ;
debug('console',msg);
}
$(document).ready(function() {
// Execute when the DOM is fully loaded.
iniPage();
});
$(window).smartresize(function(){
// Execute after a window resize.
iniPage();
});
</script>
</body>
</html>
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