js---数组习题---

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   <html xmlns="http://www.w3.org/1999/xhtml"><head>
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  <title>数组练习：各种数组方法的使用</title>
   <style>
   div{color:green;padding:10px 15px;margin:12px 0;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;word-wrap:break-word;}
   </style>
   <script type="text/javascript">
   window.onload = function ()
  {
      var aDiv = document.getElementsByTagName("div");
      var aInput = document.getElementsByTagName("input");
      var i = 0;
      var bS1 = bS2 = true;
      var aTmp = [];
      //删除/添加第一项
      aInput[0].onclick = function ()
      {
          aTmp = getArray(aDiv[0].innerHTML);
          bS1 ?
          //删除第一项， shift()方法
         (aTmp.shift(), this.value = this.value.replace("删除","添加"), bS1 = false) :
        //添加第一项, unshift()方法
          (aTmp.unshift("January(1)"), this.value = this.value.replace("添加","删除"), bS1 = true);
          //输出
          aDiv[0].innerHTML = aTmp.join()
      };

     //删除/添加最后一项
      aInput[1].onclick = function ()
      {
          aTmp = getArray(aDiv[0].innerHTML);
          bS2 ?
          //删除最后一项, pop()方法
          (aTmp.pop(), this.value = this.value.replace("删除","添加"), bS2 = false) :
         //添加最后一项, push()方法
          (aTmp.push("December(12)"), this.value = this.value.replace("添加","删除"), bS2 = true);
          //输出
          aDiv[0].innerHTML = aTmp.join()
      };

     //复制, concat()方法
      aInput[2].onclick = function ()
    {
         aTmp = getArray(aDiv[1].innerHTML);
         //输出
         aDiv[1].innerHTML = aTmp.concat(aTmp).toString().replace(/\s/g,"")
      };

      //还原, 利用数组的 length 特点
      aInput[3].onclick = function ()
      {
          aTmp = getArray(aDiv[1].innerHTML);
          //设置数组长度
          aTmp.length = 10;
         //输出
          aDiv[1].innerHTML = aTmp.join()
      };

      //第三组数据还原
      aInput[4].onclick = function ()
      {
          aTmp = ["red","green","blue","white","yellow","black","brown"];
          //输出
         aDiv[2].innerHTML = aTmp.join()
      };

      //删除前三项
      aInput[5].onclick = function ()
      {
          aTmp = getArray(aDiv[2].innerHTML);
          //删除, 0开始, 删除3个
          aTmp.splice(0, 3);
        //输出
          aDiv[2].innerHTML = aTmp.join()
      };

      //删除第二至三项
      aInput[6].onclick = function ()
      {
         aTmp = getArray(aDiv[2].innerHTML);
         //删除, 2开始, 删除2个
          aTmp.splice(1, 2);
          //输出
          aDiv[2].innerHTML = aTmp.join()
     };

      //在第二顶后插入"orange", "purple"
     aInput[7].onclick = function ()
     {
        aTmp = getArray(aDiv[2].innerHTML);
        //插入, 2开始, 插入"orange", "purple"
         aTmp.splice(1, 0, "orange", "purple");
        //输出
         aDiv[2].innerHTML = aTmp.join()
     };

     //替换第二项和第三项
    aInput[8].onclick = function ()
     {
        aTmp = getArray(aDiv[2].innerHTML);
         //插入, 2开始替换
         aTmp.splice(1, 2, "#009900", "#0000ff");
         //输出
        aDiv[2].innerHTML = aTmp.join()
    };

    //将div中的内容转为数组
     //str    div对象
     function getArray(str)
    {
         aTmp.length = 0;
        str = str.split(",");
         for (var i in str)aTmp.push(str[i]);
         return aTmp
     }
 }
</script>
 </head>
 <body>
 <div>January(1),February(2),March(3),April(4),May(5),June(6),July(7),Aguest(8),September(9),October(10),November(11),December(12)</div>
 <input value="删除January(1)" type="button">
 <input value="删除December(12)" type="button">
<div>0,1,2,3,4,5,6,7,8,9</div>
 <input value="复制" type="button">
<input value="还原" type="button">
 <div>red,green,blue,white,yellow,black,brown</div>
 <input value="还原" type="button">
 <input value="删除前三项" type="button">
 <input value="删除第二至三项" type="button">
 <input value="在第二项后插入(orange, purple)" type="button">
 <input value="替换第二项和第三项" type="button">

</body></html>