Question

我在许多地方读到,

$(function() {
    // code...
});

或

var myFunc = function() {
   // code...
}();

我的问题是,你以后如何称呼这些功能?因为简单的宣言

function myFunc() {
    // code...
}

可以很容易地被回忆, 但不会自动启动。我不得不手动在加载时给它们打电话, 而那很烦人, 占用代码中的空格, 如果我忘记了, 它可能是一个错误源。

如果你不明白我的解释,这里举一个例子:

I have a "weight" and a "height" field in my form, and i need to calculate the BMI (Body Mass Index). When the page loads, the weight and height are filled by the database, then i launch the calculation when everything s ready. But later, if the user changes the weight or the height, the BMI have to recalculate immediately. What s the best way to do that ? Using jquery or pure JS, I don t mind.

谢谢

Answer 1

一个可重复使用的即时功能

var reference = (function thename(){

    //function body

    return thename; //return the function itself to reference

}()); //auto-run


reference(); //call it again
reference(); //and again

请注意,调用此函数返回您刚才调用的函数的引用。

var anotherReference = reference(); //anotherReference === reference

友情链接