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。
闭包是由捆绑起来(封闭的)的函数和函数周围状态(词法环境)的引用组合而成。换言之,闭包让函数能访问它的外部作用域。在 JavaScript 中,闭包会随着函数的创建而同时创建。
String.prototype.contains See also 这篇翻译不完整。请帮忙从英语翻译这篇文章。 includes() 方法用于判断一个字符串是否被包含在另一个字符串中,如果是返回true,否则返回false。 语法 str.includes(searchString[, position]) 参数 searchString 将要搜寻的子字符串。 position 可选。从当前字符串的哪个索引位置...
In JavaScript, everything is an object. An object is a collection of related functionality stored in a single grouping. You can create your own objects, but that is quite advanced. The built-in objects that your browser contains allow you to do lots of useful things. For example, we first...
The following provides a means of ensuring that going through a string loop always provides a whole character, even if the string contains characters that are not in the Basic Multi-lingual Plane. var str = 'A \uD87E\uDC04 Z'; // We could also use a non-BMP character directly for (...
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
Element.insertAdjacentHTML() Element.outerHTML Parsing HTML or XML into a DOM tree:DOMParser Serializing a DOM tree into an XML string:XMLSerializer Element.getHTML() ShadowRoot.getHTML() Element.setHTMLUnsafe() ShadowRoot.setHTMLUnsafe()
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
The HTML element is used to embed executable code or data; this is typically used to embed or refer to JavaScript code. The element can also be used with other languages, such as WebGL's GLSL shader programming language and JSON.
1.查询标签//查询标签NSString *str =@"var word = document.getElementById('word');"@"alert(word.innerHTML)"; [webView stringByEvaluatingJavaScriptFromString:str];2.为网页添加标签: NSString*str =@"var img = document.createElement('img');""img.src = 'icon5.jpg';""img.width = 300;"...