jquery文本背景镂空效果js代码

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以下是 jquery文本背景镂空效果js代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>jquery文本背景镂空效果</title>
    <link rel="stylesheet" type="text/css" href="style.css">

    <script type="text/javascript" src="jquery.min.js"></script>
    <script type="text/javascript" src="move-bg.js"></script>

    <script type="text/javascript">
        $(document).ready(function () {

            moveBgAround();

        });

        function moveBgAround() {
            var x = Math.floor(Math.random() * 401);
            var y = Math.floor(Math.random() * 401);

            var time = Math.floor(Math.random() * 1001) + 2000;

            $('.scrollBg').animate({
                backgroundPosition: '(' + (x * -1) + 'px ' + (y * -1) + 'px)'
            }, time, "swing", function () {
                moveBgAround();
            });
        }

    </script>

</head>

<body>
    <div class='content'>
        <h1></h1>

        <h2>Examples:</h2>
        <div class='scrollBg' style='background-image: url(pattern_2.jpg)'>
            <img src='overlay.png' alt='' />
        </div>
        <div class='scrollBg' style='background-image: url(pattern_3.jpg)'>
            <img src='overlay.png' alt='' />

        </div>
        <div class='scrollBg' style='background-image: url(pattern_1.jpg)'>
            <img src='overlay.png' alt='' />
        </div>
        <div class='scrollBg' style='background-image: url(pattern_4.jpg)'>
            <img src='overlay.png' alt='' />
        </div>
    </div>
</body>
</html>

JS代码(move-bg.js):

/** * @author Alexander Farkas * v. 1.21 */
(function($){
	if(!document.defaultView || !document.defaultView.getComputedStyle){
	// IE6-IE8var oldCurCSS = jQuery.curCSS;
	jQuery.curCSS = function(elem,name,force){
	if(name === 'background-position'){
	name = 'backgroundPosition';
}
if(name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[ name ]){
	return oldCurCSS.apply(this,arguments);
}
var style = elem.style;
	if ( !force && style && style[ name ] ){
	return style[ name ];
}
return oldCurCSS(elem,'backgroundPositionX',force) +' '+ oldCurCSS(elem,'backgroundPositionY',force);
}
;
}
var oldAnim = $.fn.animate;
	$.fn.animate = function(prop){
	if('background-position' in prop){
	prop.backgroundPosition = prop['background-position'];
	delete prop['background-position'];
}
if('backgroundPosition' in prop){
	prop.backgroundPosition = '('+ prop.backgroundPosition;
}
return oldAnim.apply(this,arguments);
}
;
	function toArray(strg){
	strg = strg.replace(/left|top/g,'0px');
	strg = strg.replace(/right|bottom/g,'100%');
	strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
	var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
	return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
}
$.fx.step. backgroundPosition = function(fx){
	if (!fx.bgPosReady){
	var start = $.curCSS(fx.elem,'backgroundPosition');
	if(!start){
	//FF2 no inline-style fallbackstart = '0px 0px';
}
start = toArray(start);
	fx.start = [start[0],start[2]];
	var end = toArray(fx.options.curAnim.backgroundPosition);
	fx.end = [end[0],end[2]];
	fx.unit = [end[1],end[3]];
	fx.bgPosReady = true;
}
//return;
	var nowPosX = [];
	nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
	nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
	fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
}
;
}
)(jQuery);

CSS代码(style.css):

body{background-color:#000000;color:#cdcdcd;font-family:helvetica,arial,sans-serif;}
a{color:#ff7e00;}
a:hover{color:#ffb400;}
.content{width:500px;margin:0px auto;}
.scrollBg{background-image:url(pattern_2.jpg);background-color:#000000;width:487px;height:83px;}
.scrollBg img{display:block;}

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