了解更多并加入 MDN Web Docs 社区。 函数 上一页 下一页 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。 参见JavaScript ...
像 7 或'foo' 这样的原始值会使用相关的构造函数转换为对象,所以原始数值 7 会被转换为一个 Number 包装类,字符串 'foo' 会被转换为一个 String 包装类。 jsCopy to Clipboard function bar() { console.log(Object.prototype.toString.call(this)); } bar.call(7); // [object Number] bar.call("...
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For code running at the URL https://developer.mozilla.org/en-US/docs/Web, this example would set currentDomain to the string "developer.mozilla.org". jsCopy to Clipboard const currentDomain = document.domain; The getter for this property returns the domain portion of the current document's ...
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DOMString 是編碼為 UTF-16 的字串。當 JavaScript 使用這類字串時, DOMString 會映射成一個 String. 傳送null 給接受 DOMString 的method 或參數時,會將其轉換成 "null"。 Specifications SpecificationStatusComment Web IDL (Second Edition)The definition of 'DOMString' in that specification. Candidate Recomm...
MDN Web Docs, previously known as the Mozilla Developer Network, is one of the best documentation sources for web development around. It's a fantastic resource for learning everything from new CSS properties to the latest APIs for Chrome extensions, and now the site has a brand new look and...
A string that represents the element's step attribute, which works with min and max to limit the increments at which a numeric or date-time value can be set. It can be the string any or a positive floating point number. If this is not set to any, the control accepts only values at...