可以使用String作为toString()更可靠的代替方法,因为它在用于null和undefined时仍然有效。例如: js constnullVar=null;nullVar.toString();// TypeError: nullVar is nullString(nullVar);// "null"constundefinedVar=undefined;undefinedVar.toString();// TypeError: undefinedVar is undefinedString(undefinedVar);/...
函数是 JavaScript 中的基本组件之一。JavaScript 中的函数类似于过程——一组执行任务或计算值的语句。但要成为函数,这个过程应该接受输入并返回与输入存在某些明显关系的输出。要使用一个函数,你必须将其定义在你希望调用它的作用域内。
Learn about the Document interface, including its constructor, properties, and methods, specifications and browser compatibility.
The elements are converted to Strings using their toLocaleString methods and these Strings are separated by a locale-specific String (such as a comma “,”). toLocaleString: The toLocaleString() method returns a string with a language sensitive representation of this number. toLocaleTimeString: ...
我们曾经说过,现在我们重申一遍—在javascript中,一切东西都可以被当做对象。 When you create a string, your variable becomes a string object instance, and as a result has a large number ofproperties(即.XXX)andmethods(即.XXX())available to it. ...
String Non-standard String generic methods like String.slice(myStr, 0, 12), String.replace(myStr, /\./g, "!"), etc. have been introduced in Firefox 1.5 (JavaScript 1.6), deprecated in Firefox 53, and removed in Firefox 68. You can use methods on String.prototype together with Function...
Learn about the CSSStyleSheet interface, including its constructor, properties, and methods, specifications and browser compatibility.
Methods String.fromCharCode() String.fromCodePoint() String.prototype.anchor() String.prototype.big() String.prototype.blink() String.prototype.bold() String.prototype.charAt() String.prototype.charCodeAt() String.prototype.codePointAt() String.prototype.concat() String.prototype.endsWith() String.prot...
HTML #dom-settimeout-dev See also Polyfill ofsetTimeoutwhich allows passing arguments to the callback incore-js Window.clearTimeout() WorkerGlobalScope.setTimeout() Window.setInterval() Window.requestAnimationFrame() Window.queueMicrotask()...
There's also no option to pass a thisArg to setTimeout as there is in Array methods such as forEach() and reduce(). As shown below, using call to set this doesn't work either.jsCopy to Clipboard setTimeout.call(myArray, myArray.myMethod, 2.0 * 1000); // error setTimeout.call...