<script>
function getMoblieNum(){
var numArray = new Array("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");  //這是目前找到的除了數(shù)據(jù)卡外的手機卡前三位，類型是字符串數(shù)組
var numList = "";  //創(chuàng)建一個數(shù)組用來存放10個手機號
var arraryLength = numArray.length;  //獲取數(shù)組長度，這樣如果手機號前三位取值單位發(fā)生變化，在下一步求i的地方就不用修改隨機數(shù)取值范圍了
for( var n = 0; n < 10; n++){
var i = parseInt( Math.random() * arraryLength); //注意乘以的是上面numArray數(shù)組的長度，這樣就可以取出數(shù)組中的隨機一個數(shù)。random的取值范圍是大于等于0.0，小于1.0，相乘后得到的就是0到（數(shù)組長度-1）的值。
var num = numArray[i];  //取出隨機的手機號前三位并賦值給num，手機號前三位是字符串類型的
for ( var j = 0; j < 8; j++){
num = num + Math.floor(Math.random() * 10);   //num是字符串，后面的數(shù)字被當做字符串。所以變成兩個字符串拼接了
}
if(n == 0){
numList = numList + num;  //第一個手機號前不出現(xiàn)“，”
}
else{numList = numList + "," + num;}  //從第一個手機號后面到最后一個之前用逗號分隔
}
var numSpan = document.getElementById("moblieNum");
numSpan.innerHTML = numList; //修改span的內(nèi)容，每次都是清空修改，而不是疊加
}
</script>

<input type='button' value='隨機生成10個電話號碼' onclick='getMoblieNum()' /><br/>
電話號碼：<div id='moblieNum'></div>