规范 if("x"inwindow){// 只有 x 被全局性的定义 才会执行这些语句} Void 操作符和 undefined void操作符是第三种可以替代的方法。 js varx;if(x===void0){// 执行这些语句}// 没有声明 yif(y===void0){// 抛出一个 RenferenceError 错误(与 `typeof` 相比)}...
附加参考页面 类 JavaScript 类。 constructor extends 私有属性 公有类字段 static 静态初始化块
Learn about the Document interface, including its constructor, properties, and methods, specifications and browser compatibility.
link: The link() method creates an <a> HTML element that causes a string to be displayed as a hypertext link to another URL. localeCompare: The localeCompare() method returns a number indicating whether a reference string comes before or after or is the same as the given string in sort...
htmlCopy to Clipboard <button onclick="alert((function(){return this})());">Show inner this</button> 在这种情况下,内部函数的 this 指向globalThis 对象(即非严格模式下,调用的函数未设置 this 时指向的默认对象)。 类中的绑定方法 和其他普通函数一样,方法中的 this 值取决于它们如何被调用。有时...
HTML scripting Reference Web Contributors to this page:torbasow,phistuck,jaffathecake,gurdiga,jonathanKingston,Sebastianz,pallxk,wbamberg,jswisher,mgwhitfield,sideshowbarker,fbender,Nickolay,jpmedley,Jeremie,kdex,Luke314,fusionchess,Syrian-Guy,Botulism,CTN444,Oliver,kscarfone,karlwestin,acdha,ethertank...
innerHTML 1 Toggle history 12 Toggle history 1 Toggle history 8 Toggle history 1 Toggle history 18 Toggle history 4 Toggle history 10.1 Toggle history 1 Toggle history 1.0 Toggle history 1 Toggle history Legend Tip: you can click/tap on a cell for more information. ...
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Learn about the Element.innerHTML property, including its type, code examples, specifications, and browser compatibility.