<!DOCTYPE html> <html lang="en" xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8" /> <title></title> </head> <body> <script type="text/javascript"> // -> 基本类型：数字类型number、布尔类型boolean、字符串类型string //-> 引用类型：对象类型、函数类型 //-> 空类型：null和undefined //-> 运算符：typeof var sum = 0; for (var i = 1; i < 100; i++) { sum += i; } //遍历数组 var arr = [1, "ab", "ob", 90]; alert(typeof arr); for (var i in arr) { console.log(arr[i]); } //键值对 var keys = { "a": "张飞", "b": "关羽" }; for (var i in keys) { console.log(keys[i]); } //水仙花数 for (var i = 100; i < 1000; i++) { var gsum = i % 10; var ssum = parseInt(i / 10) % 10; var bsum = parseInt(i / 100); if (i==(Math.pow(gsum,3)+Math.pow(ssum,3)+Math.pow(bsum,3)) ){ console.log(i); } } //alert(sum) //打印到控制台 适合调试 // alert(typeof "aaa"); console.log("Hello world"); </script> </body> </html>
原文：http://www.cnblogs.com/xh0626/p/4861414.html