jquey的setInterval让元素动起来，代码很简单，如下
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<!DOCTYPE html >
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<html>
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<head>
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<title>playing with the DOM</title>
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<script src=""></script>
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</head>
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<body>
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<h1 id="heading">Hello world</h1>
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<script>
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var leftOffset = 0;
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var moveHeading = function(){
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$("#heading").offset({left:leftOffset});
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leftOffset++;
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if(leftOffset > 200){
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leftOffset=0;
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}
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}
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setInterval(moveHeading,30);
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</script>
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</body>
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</html>
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