数组练习：各种数组方法的使用
<!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>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); if(bS1){ // shift删除第一个元素，并返回它的值 aTmp.shift(); this.value = this.value.replace('删除','添加'); bS1 = false; }else{ //unshift头部添加，返回新的长度 aTmp.unshift('January(1)'); this.value = this.value.replace('添加','删除'); bS1 = true; } // 将aTmp字符串拼接起来，放到第一个div里面 aDiv[0].innerHTML = aTmp.join(); }; // 删除/添加最后一项 aInput[1].onclick = function(){ aTmp = getArray(aDiv[0].innerHTML); if(bS2){ // pop删除最后一个元素，并返回它的值 aTmp.pop(); this.value = this.value.replace('删除','添加'); bS2 = false; }else{ //push尾部添加，返回新的长度 aTmp.push('December(12)'); this.value = this.value.replace('添加','删除'); bS2 = true; } aDiv[0].innerHTML = aTmp.join(); }; //复制, concat()方法【concat() 方法用于连接两个或多个数组】 aInput[2].onclick = function(){ aTmp = getArray(aDiv[1].innerHTML); // s 匹配任何空白字符，包括空格、制表符、换页符等等。等价于 [ f v]。 // g 全文匹配 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; // 将数组中的所有元素放入一个字符串 aDiv[1].innerHTML = aTmp.join(); }; //第三组数据还原 aInput[4].onclick = function(){ aTmp = ["red","green","blue","white","yellow","black","brown"]; 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); aDiv[2].innerHTML = aTmp.join(); }; //删除第二、三两项 aInput[6].onclick = function(){ aTmp = getArray(aDiv[2].innerHTML); //删除, 2开始, 删除2个 aTmp.splice(1,2); 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, 删除0个，插入"orange", "purple" aTmp.splice(1,0,'orange','purple'); alert(aTmp); 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'); 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 type="button" value="删除January(1)" /> <input type="button" value="删除December(12)" /> <div>0,1,2,3,4,5,6,7,8,9</div> <input type="button" value="复制" /> <input type="button" value="还原" /> <div>red,green,blue,white,yellow,black,brown</div> <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>