Home >Web Front-end >JS Tutorial >Summarize various common uses of JavaScript arrays
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：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript各种数组方法的使用</title>
<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;}
</style>
<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
}
}
</script>
</head>
<body>
<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)</p>
<input type="button" value="删除January(1)" />
<input type="button" value="删除December(12)" />
<p>0,1,2,3,4,5,6,7,8,9</p>
<input type="button" value="复制" />
<input type="button" value="还原" />
<p>red,green,blue,white,yellow,black,brown</p>
<input type="button" value="还原" />
<input type="button" value="删除前三项" />
<input type="button" value="删除第二至三项" />
<input type="button" value="在第二项后插入(orange, purple)" />
<input type="button" value="替换第二项和第三项" />
</body>
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