一、立即执行函数表达式(Immediately Invoked Function Expression, IIFE)。这种模式在JavaScript中常用于创建一个独立的作用域,以避免变量污染全局命名空间。常见的例子可以分解如下:(function (window) { // 这里可以写任何需要执行的代码 })(window);在这个例子中,function (window) { ... } 是一个匿名函数,它...
Immediately-Invoked Function Expression(即调函数表达式)是什么?它是一个被立即调用的函数表达式。就像它的名字想表达的那样。 我喜欢看到JavaScript社区成员在他们的文章和陈述中采用术语“Immediately-Invoked Function Expression”和“IIFE”,因为我感觉该术语使得理解这个概念更容易,并且因为术语“self-executing anonymous...
js 闭包 匿名函数 JavaScript的IIFE(即时执行方法)immediately-invoked function expression 参考:http://segmentfault.com/a/1190000000348228 http://segmentfault.com/q/1010000000442042 问题: (function(){ function a(){ alert("a"); } })();这里的(function(){xxx})(); 是什么意思,为什么这么写,有什么...
(function() { alert("Parentheses around the function"); })(); (function() { alert("Parentheses around the whole thing"); }()); !function() { alert("Bitwise NOT operator starts the expression"); }(); +function() { alert("Unary plus starts the expression"); }(); 我建了一个前端...
我希望看到 JavaScript 社区里更多人使用“Immediately-Invoked Function Expression”和“IIFE”的称呼,我觉得这个名称可以更好的诠释这种模式的概念,而“self-executing anonymous function”确实不够准确。 // 这是一个 self-executing function,它执行它自身:function foo() { foo(); }// 这是一个 self-executing...
Javascript allows a function to be called immediately after it is created without even invoking it. It is called Immediately Invoked Function Expression. Syntax var object = (function( /*arguments(if any)*/ ) { /*code to be executed*/ /*return ifany */ })( /*arguments(if any)...
An Immediately-invoked Function Expression is a way to execute functions immediately, as soon as they are created. IIFEs are very useful because they don't pollute the global object, and they are a simple way to isolate variables declarations...
Immediately Invoked Function Expression (IIFE) is one of the most popular design patterns in JavaScript. It pronounces like iify. IIFE has been used since long by JavaScript community but it had misleading term "self-executing anonymous function". Ben Alman gave it appropriate name "Immediately ...
In this article, we are going to look at another function letiation known as an Immediately Invoked Function Expression. Friends like us just call it IIFE (pronounced "iffy"). At first, what it does might seem a bit boring and unnecessary. As we get more familiar with it, I will descri...
The function becomes a function expression which is immediately executed. The variable within the expression can not be accessed from outside it. (function() {varaName = "Barry"; })();//Variable name is not accessible from the outside scopeaName//throws "Uncaught ReferenceError: aName is ...