<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><script>
function getMoblieNum(){
var numArray =newArray("139","138","137","136","135","134","159","158","157","150","151","152","188","187","182","183","184","178","130","131","132","156","155","186","185","176","133","153","189","180","181","177");//这是目前找到的除了数据卡外的手机卡前三位，类型是字符串数组
var numList ="";//创建一个数组用来存放10个手机号
var arraryLength = numArray.length;//获取数组长度，这样如果手机号前三位取值单位发生变化，在下一步求i的地方就不用修改随机数取值范围了for( var n =0; n <10; n++){
var i =parseInt( Math.random()* arraryLength);//注意乘以的是上面numArray数组的长度，这样就可以取出数组中的随机一个数。random的取值范围是大于等于0.0，小于1.0，相乘后得到的就是0到（数组长度-1）的值。
var num = numArray[i];//取出随机的手机号前三位并赋值给num，手机号前三位是字符串类型的for( var j =0; j <8; j++){
num = num + Math.floor(Math.random()*10);//num是字符串，后面的数字被当做字符串。所以变成两个字符串拼接了}if(n ==0){
numList = numList + num;//第一个手机号前不出现“，”}else{numList = numList +"<br/>"+ num;}//从第一个手机号后面到最后一个之前用逗号分隔}
var numSpan = document.getElementById("moblieNum");
numSpan.innerHTML = numList;//修改span的内容，每次都是清空修改，而不是叠加}</script></head><body><input type='button' value='随机生成10个电话号码' onclick='getMoblieNum()'/><br/>
电话号码：<div id='moblieNum'></div></body></html>
