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CSS Layout - 如何基于div的列布局

column 【column】
我们想知道如何基于div的列布局。
代码展示 运行结果 

<html>
<head>
<style>
#header {
  height: 120px;
  background-color: #cccccc;
  padding: 10px;
}

#navigation {
  height: 40px;
  line-height: 40px;
  background-color: #efefef;
  padding: 10px;
}

.column1of3, .column2of3, .column3of3 {
  float: left;
  width: 280px;
  background-color: #cccccc;
  padding: 10px;
  margin-top: 20px;
}

.column1of3, .column2of3, .columns1and2of3 {
  margin-right: 20px;
}

.columns1and2of3, .columns2and3of3 {
  float: left;
  width: 600px;
  background-color: #cccccc;
  padding: 10px;
  margin-top: 20px;
}

.column1of4, .column2of4, .column3of4, .column4of4 {
  float: left;
  width: 200px;
  background-color: #cccccc;
  padding: 10px;
  margin-top: 20px;
}

.column1of4, .column2of4, .column3of4 {
  margin-right: 20px;
}

.columns2and3and4of4 {
  float: left;
  width: 680px;
  background-color: #cccccc;
  padding: 10px;
  margin-top: 20px;
}

.column1of6, .column2of6, .column3of6, .column4of6, .column5of6,
  .column6of6 {
  float: left;
  width: 120px;
  background-color: #cccccc;
  padding: 10px;
  margin-top: 20px;
}

.column1of6, .column2of6, .column3of6, .column4of6, .column5of6 {
  margin-right: 20px;
}

.column1of3, .column1of4, .column1of6 {
  clear: both;
}

#footer {
  height: 40px;
  clear: both;
  border-top: 20px solid #ffffff;
  padding: 10px;
  background-color: #cccccc;
}

#page {
  padding: 0px 10px 10px 10px;
  width: 940px;
  background-color: #ffffff;
}

#frame {
  margin-left: auto;
  margin-right: auto;
  width: 960px;
  background-color: #ffffff;
}

body {
  background-color: #efefef;
  margin: 0px;
}
</style>
</head>
<body>
  <div id="frame">
    <div id="page">

      <div id="header">header</div>
      <div id="navigation">navigation</div>

      <div class="column1of3">column 1 of 3</div>
      <div class="column2of3">column 2 of 3</div>
      <div class="column3of3">column 3 of 3</div>

      <div class="column1of3">column 1 of 3</div>
      <div class="columns2and3of3">columns 2 and 3 of 3</div>

      <div class="columns1and2of3">columns 1 and 2 of 3</div>
      <div class="column3of3">column 3 of 3</div>

      <div class="column1of4">column 1 of 4</div>
      <div class="column2of4">column 2 of 4</div>
      <div class="column3of4">column 3 of 4</div>
      <div class="column4of4">column 4 of 4</div>

      <div class="column1of4">column 1 of 4</div>
      <div class="columns2and3and4of4">columns 2 and 3 and 4 of 4</div>

      <div class="column1of6">column 1 of 6</div>
      <div class="column2of6">column 2 of 6</div>
      <div class="column3of6">column 3 of 6</div>
      <div class="column4of6">column 4 of 6</div>
      <div class="column5of6">column 5 of 6</div>
      <div class="column6of6">column 6 of 6</div>


      <div class="column1of3">column 1 of 3</div>
      <div class="column2of3">column 2 of 3</div>
      <div class="column5of6">column 5 of 6</div>
      <div class="column6of6">column 6 of 6</div>

      <div class="columns1and2of3">columns 1 and 2 of 3</div>
      <div class="column5of6">column 5 of 6</div>
      <div class="column6of6">column 6 of 6</div>

      <div id="footer">footer</div>

    </div>
  </div>
</body>
</html>