案例：jQuery UI案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!doctype html>
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<html lang="en">
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<head>
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  <meta charset="utf-8">
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  <title>.position() 实例</title>
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  <link rel="stylesheet" href="/css/jqu1.10.4/jquery-ui.min.css">
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  <style>
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  .positionDiv {
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    position: absolute;
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    width: 75px;
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    height: 75px;
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    background: green;
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  }
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  </style>
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  <script src="/js/jqu/jquery.min1.10.2.js"></script>
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  <script src="/js/jqu/jquery-ui.min1.10.4.js"></script>
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</head>
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<body>
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<div id="targetElement">
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  <div class="positionDiv" id="position1"></div>
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  <div class="positionDiv" id="position2"></div>
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  <div class="positionDiv" id="position3"></div>
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  <div class="positionDiv" id="position4"></div>
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</div>
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<script>
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$( "#position1" ).position({
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  my: "center",
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  at: "center",
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  of: "#targetElement"
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});
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$( "#position2" ).position({
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  my: "left top",
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  at: "left top",
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  of: "#targetElement"
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});
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$( "#position3" ).position({
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  my: "right center",
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  at: "right bottom",
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  of: "#targetElement"
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});
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$( document ).mousemove(function( event ) {
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  $( "#position4" ).position({
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    my: "left+3 bottom-3",