http://stackoverflow.com/questions/6429225/javascript-null-or-undefined var x; x == null // true x == undefined // true x === null // false x === undefined // true var y = null; y == null // true y == undefined // true y === null // true y === undefi
Silverlight If the target managed property or input parameter is strongly typed (that is, not typed as an object), Silverlight attempts to convert the JavaScript object to the corresponding .NET Framework object. If the conversion fails (because of m
javascript里怎么检查一个未定义的变量? in JavaScript null is an object. There's another value for things that don't exist, undefined. The DOM returns null for almost all cases where it fails to find some structure in the document, but in JavaScript itself undefine
转自:http://google.github.io/styleguide/javascriptguide.xml Google JavaScript Style Guide Revision 2.93 Aaron Whyte Bob Jervis Dan Pupius Erik Arvidsson Fritz Schneider Robby Walker Each style point has a summary for which additional information is ava
mongodb的C#封装,驱动是samus/mongodb-csharp 1.连接类 using MongoDB; using MongoDB.Linq; namespace DBModel { public class ConnString { public static string m_connStr = System.Configuration.ConfigurationManager.AppSettings["mongodb_ip"];// "Server=127.
1.定义正则表达式 /.../ 用于定义正则表达式 /.../g 表示全局匹配 /.../i 表示不区分大小写 /.../m 表示多行匹配 2.匹配正则表达式 非全局模式,不分组 var pattern = /^Java\w*/m; var text = "JavaScript is more fun than JavaEE or JavaBeans!"; pattern.exec(text) pattern.exec(text) pattern.exec(text)执行结果: [&