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方法一：
1 <script type="text/javascript"> 2 var img01 = new Image(); 3 var img02 = new Image(); 4 var img03 = new Image(); 5 var img04 = new Image(); 6 img01.src = "img/1.jpg"; 7 img02.src = "img/2.jpg"; 8 img03.src = "img/3.jpg"; 9 img04.src = "img/4.jpg"; 10 </script>
缺点：如果加载图片较多，比较麻烦
方法二：
var images = new Array();
function preLoad() {
for (var i = 0; i < preLoad.arguments.length; i++) {
imgs[i] = new Image();
imgs[i].src = preLoad.arguments[i];
}
}
preLoad("img/1.jpg", "img/2.jpg", "img/3.jpg")
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原文地址：http://www.cnblogs.com/yinzf/p/5901840.html
