Javascript中没有名称的函数与名称和函数之间的区别 [英] Difference between function with a name and function without name in Javascript

问题描述

1。

function abc(){
    alert("named function");
}

v / s

2.

function(){
    alert("Un-Named function");
}

请从初学者点解释。

推荐答案

它们的工作方式完全相同。只有你能够如何运行它们才是不同的。

They work exactly the same. It's only in how you are able to run them that they are different.

所以示例＃1你可以随时用 abc再次呼叫（ ）; 。例如2，你要么必须将它作为参数传递给另一个函数，要么设置一个变量来存储它，如下所示：

So example #1 you could call again at any point with abc();. For example 2, you would either have to pass it as a parameter to another function, or set a variable to store it, like this:

var someFunction = function() {
    alert("Un-Named function");
}

以下是如何将其传递到另一个函数并运行它。

Here's how to pass it into another function and run it.

// define it
function iRunOtherFunctions(otherFunction) {
    otherFunction.call(this);
}

// run it
iRunOtherFunctions(function() {
    alert("I'm inside another function");
});

正如David在下面提到的那样，你也可以立即拨打它：

As David mentions below, you can instantly call it too:

(function() {
    alert("Called immediately");
})(); // note the () after the function.

这篇关于Javascript中没有名称的函数与名称和函数之间的区别的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！