<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據卡外的手機卡前三位，類型是字符串數組var numList = "";  //創建一個數組用來存放10個手機號var arraryLength = numArray.length;  //獲取數組長度，這樣如果手機號前三位取值單位發生變化，在下一步求i的地方就不用修改隨機數取值范圍了for( var n = 0; n < 10; n++){var i = parseInt( Math.random() * arraryLength); //注意乘以的是上面numArray數組的長度，這樣就可以取出數組中的隨機一個數。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“，”}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>