Learn about the Document interface, including its constructor, properties, and methods, specifications and browser compatibility.
function map(f, a) { const result = new Array(a.length); for (let i = 0; i < a.length; i++) { result[i] = f(a[i]); } return result; } 在以下代码中,该函数接收由函数表达式定义的函数,并对作为第二个参数接收的数组的每个元素执行该函数: jsCopy to Clipboard function map(f,...
arrayLike2:"c",};console.log(Array.prototype.some.call(arrayLike,(x)=>typeofx==="number"));// false Specification ECMAScript® 2026 Language Specification #sec-array.prototype.some 参见 core-js中Array.prototype.every的 polyfill 索引集合 ...
Method definitions Rest parameters getter setter Classes constructor extends static Errors Error: Permission denied to access property "x" InternalError: too much recursion RangeError: argument is not a valid code point RangeError: invalid array length RangeError: precision is out of range RangeError:...
array是一个由ArrayBuffer,AiTayBufferYiew,Blob,DOMString等对象构成的Arra 工,或者其他类似对象的混合体,它将会被放进Blob. •options是一个可选的Blob熟悉字典,它可能会指定如下两种属性: otype,默认值为”:它代表了将会被放入到blob中的数组内容的MIME类型。
Learn about the Window.setTimeout() method, including its syntax, code examples, specifications, and browser compatibility.
js window.onresize=(e)=>console.log(e.currentTarget);document.body.onresize=(e)=>console.log(e.currentTarget); html In all three cases, you see theWindowobject logged ascurrentTarget. Specification
There is no way to stop or break aforEach()loop other than by throwing an exception. If you need such behavior, theforEach()method is the wrong tool, use a plain loop instead. If you are testing the array elements for a predicate and need a Boolean return value, you can useevery(...
Learn about the Window.setTimeout() method, including its syntax, code examples, specifications, and browser compatibility.
Learn about the Window.setInterval() method, including its syntax, code examples, specifications, and browser compatibility.