javascript Javascript中带名字的函数和不带名字的函数的区别
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Difference between function with a name and function without name in Javascript
提问by Shwet
1.
1.
function abc(){
alert("named function");
}
v/s
比/秒
2.
2.
function(){
alert("Un-Named function");
}
Kindly explain from beginners point.
请从初学者的角度解释一下。
采纳答案by Jordan
They work exactly the same. It's only in how you are able to run them that they are different.
它们的工作原理完全相同。它们的不同之处仅在于您如何运行它们。
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:
因此，示例 #1 您可以随时使用abc();. 例如 2，您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：
var someFunction = function() {
alert("Un-Named function");
}
Here's how to pass it into another function and run it.
这是将它传递给另一个函数并运行它的方法。
// define it
function iRunOtherFunctions(otherFunction) {
otherFunction.call(this);
}
// run it
iRunOtherFunctions(function() {
alert("I'm inside another function");
});
As David mentions below, you can instantly call it too:
正如大卫在下面提到的，你也可以立即调用它：
(function() {
alert("Called immediately");
})(); // note the () after the function.
回答by Amit
Both can be used to achieve the same but the main difference is the anonymous functions don't need a name. Anonymous functions are functions that are dynamically declared at runtime. They're called anonymous functions because they aren't given a name in the same way as normal functions.
两者都可以用来实现相同的功能，但主要区别在于匿名函数不需要名称。匿名函数是在运行时动态声明的函数。它们被称为匿名函数，因为它们不像普通函数那样被命名。
Please refer this link
请参考这个链接
