Summarize various common uses of JavaScript arrays-JS Tutorial-php.cn

Summarize various common uses of JavaScript arrays

巴扎黑

Release： 2017-09-06 10:25:54

Original

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本文实例讲述了JavaScript数组各种常见用法。分享给大家供大家参考。具体如下：

运行效果如下图所示：

具体代码如下：

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
&lt;html xmlns="http://www.w3.org/1999/xhtml">
&lt;head>
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
&lt;title>javascript各种数组方法的使用&lt;/title>
&lt;style> 
p{color:green;padding:10px 15px;margin:12px 0;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;word-wrap:break-word;}
&lt;/style>
&lt;script type="text/javascript"> 
window.onload = function ()
{
  var ap = document.getElementsByTagName("p");
  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(ap[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
    ap[0].innerHTML = aTmp.join()
  };
  //删除/添加最后一项
  aInput[1].onclick = function ()
  {
    aTmp = getArray(ap[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
    ap[0].innerHTML = aTmp.join()
  };
  //复制, concat()方法
  aInput[2].onclick = function ()
  {
    aTmp = getArray(ap[1].innerHTML);
    //输出
    ap[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(ap[1].innerHTML);
    //设置数组长度
    aTmp.length = 10;
    //输出
    ap[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
    ap[2].innerHTML = aTmp.join()
  };
  //删除前三项
  aInput[5].onclick = function ()
  {
    aTmp = getArray(ap[2].innerHTML);
    //删除, 0开始, 删除3个
    aTmp.splice(0, 3);  
    //输出
    ap[2].innerHTML = aTmp.join()
  };
  //删除第二至三项
  aInput[6].onclick = function ()
  {
    aTmp = getArray(ap[2].innerHTML);
    //删除, 2开始, 删除2个
    aTmp.splice(1, 2);  
    //输出
    ap[2].innerHTML = aTmp.join()
  };
  //在第二顶后插入"orange", "purple"
  aInput[7].onclick = function ()
  {
    aTmp = getArray(ap[2].innerHTML);
    //插入, 2开始, 插入"orange", "purple"
    aTmp.splice(1, 0, "orange", "purple");  
    //输出
    ap[2].innerHTML = aTmp.join()
  };
  //替换第二项和第三项
  aInput[8].onclick = function ()
  {
    aTmp = getArray(ap[2].innerHTML);
    //插入, 2开始替换
    aTmp.splice(1, 2, "#009900", "#0000ff");  
    //输出
    ap[2].innerHTML = aTmp.join()
  };
  //将p中的内容转为数组
  //str  p对象
  function getArray(str)
  {
    aTmp.length = 0;
    str = str.split(",");
    for (var i in str)aTmp.push(str[i]);
    return aTmp
  }
}
&lt;/script>
&lt;/head>
&lt;body>
&lt;p>January(1),February(2),March(3),April(4),May(5),June(6),July(7),Aguest(8),September(9),October(10),November(11),December(12)&lt;/p>
&lt;input type="button" value="删除January(1)" />
&lt;input type="button" value="删除December(12)" />
&lt;p>0,1,2,3,4,5,6,7,8,9&lt;/p>
&lt;input type="button" value="复制" />
&lt;input type="button" value="还原" />
&lt;p>red,green,blue,white,yellow,black,brown&lt;/p>
&lt;input type="button" value="还原" />
&lt;input type="button" value="删除前三项" />
&lt;input type="button" value="删除第二至三项" />
&lt;input type="button" value="在第二项后插入(orange, purple)" />
&lt;input type="button" value="替换第二项和第三项" />
&lt;/body>
&lt;/html>

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