<!doctype html><html><head><meta charset="utf-8"><title>36选7</title><script>//先循环36个数，放到num里面//给按钮添加事件//点击的时候 随机7个数放到jg里面var btn = null, ???num = null, ???jg = null; ???????window.onload = function(){ ???????init(); ???????initDom(); ???????event(); ???}//初始化变量 ???function init(){ ???????btn = document.getElementById("btn"); ???????num = document.getElementById("num"); ???????jg = document.getElementById("jg"); ???}//初始化页面元素的值 ???function initDom(){ ???????var str = ""; ???????for(var i = 1 ;i<37;i++){ ???????????str += i + ","; ???????} ???????str = str.substr(0,str.length-1); ?//把36个数字组成的字符串的最后一个元素删除 ???????num.innerHTML = str; ???}//添加事件 ???function event(){ ???????btn.onclick = xuanze; ???}//点击按钮的时候调用方法 ???function xuanze(){ ???????//随机七个数放到结果里面 ???????var str = ""; ???????var n = 0; ???????for(var i = 0 ;i<7;i++){ ???????????n++; ???????????var zhi = parseInt(Math.random()*36)+1; ???????????console.log(str.indexOf(zhi)); ???????????if(str.indexOf(zhi) == -1){ ?????????????????str += zhi+","; ???????????}else{ ???????????????i--; ???????????} ???????}// ???????jg.innerHTML = str+";总共循环了"+n+"次"; ???????jg.value = str+";循环了"+n+"次"; ???}</script></head><body><!--页面部分--><div id="num"></div><button id="btn">选择</button><!--结果为:<span id="jg"></span>-->结果为：<input type="text" width="1000px" id="jg" value=""></body></html>原生JS实现彩票36选7不重复（优化）
原文地址：https://www.cnblogs.com/lsqbk/p/10258967.html