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<title>ByTagName练习</title>
<style>
    div{width:50px;
    height:50px;
    background-color:green;
    position:absolute;
    left:20px;
    top:30px;
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body{margin:0;}
</style>
<script>
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    var aDiv = document.getElementsByTagName('div');
    for(var i=0; i<10; i++){
    document.body.innerHTML += '<div>' + i + '</div>' ; 
    aDiv[i].style.left = 10 + i*60 + 'px';
        };
    for(var i=0; i<aDiv.length; i++){
        aDiv[i].style.left = i*60 + 'px';
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};
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