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摘要：1 //null 只在肯定返回null值时才使用null比较 2 var element = document.getElementById("my-div"); 3 if (element === null) { 4 5 }; 6 //string number boolean undefined 7 var num = 123; 8 if (typeof num === "number") { 9 10 };11 12 /*13 检查引用值14 Date RegExp Error15 跨域的检查会有问题16 */17 if (value instan 阅读全文

摘要：using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Text;using System.Threading;using System.Threading.Tasks;namespace ConsoleApplication1{ public class Download { object LockObject = new object(); public static void Main(string[] args) ... 阅读全文