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

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> </html>

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