1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Document</title> 6 </head> 7 <body> 8 <input type="button" value="随机" id="btn1"> 9 <div id="div1"></div> 10 <script> 11 var oBtn = document.getElementById("btn1"); 12 var oDiv = document.getElementById("div1"); 13 var obj = {}; 14 15 oBtn.onclick = function(){ 16 var number = randomNum(35,7); 17 oDiv.innerHTML = number; 18 19 var oRD = Math.random(); 20 obj[oRD] = number; 21 22 window.location.hash = oRD; 23 }; 24 25 window.onhashchange = function(){ 26 //undefined时为空 27 var number = obj[ window.location.hash.substring(1) ] || "";//去掉# 28 oDiv.innerHTML = number; 29 }; 30 function randomNum(alls,now){ 31 var arr = []; 32 var newArr = []; 33 34 for(var i = 1;i <= alls;i ++){ 35 arr.push(i); 36 } 37 38 for(var i = 0;i < now;i ++){ 39 //Math.random() [0,1) 40 //Math.floor( Math.random() * arr.length 0~34 41 newArr.push( arr.splice(Math.floor( Math.random() * arr.length ),1) );//删除并返回被删除元素的数组 42 } 43 return newArr;//是一个二维数组 44 } 45 46 </script> 47 </body> 48 </html>
原文：http://www.cnblogs.com/jiujiaoyangkang/p/5876046.html