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console 命令行工具 X clear

                    
>
console
<div id="box">
  <div id="div1">1</div>
  <div id="div2">2</div>
  <div id="div3">3</div>
  <div id="div4">4</div>
  <div id="div5">5</div>
</div>
#box {
  background-color: #e1e1e1;
  border: 2px solid green;
  overflow: hidden;
}

#box div {
  width: 200px;
  float: left;
  background-color: red;
}

#div {
  heigh
}