自动执行 javascript 函数并稍后调用它们？
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Auto-execute javascript functions AND call them later?
提问by Willy
I read on many places that you can auto launch js functions on load by doing :
我在很多地方都读到过，您可以通过以下方式在加载时自动启动 js 函数：
$(function() {
// code...
});
Or
或者
var myFunc = function() {
// code...
}();
My question is, how do you call these functions later ? Because the simple declaration
我的问题是，你以后如何调用这些函数？因为简单的声明
function myFunc() {
// code...
}
can be easily recalled but doesn't auto-launch. I have to manually call them all on load, and that's annoying, take up spaces in the code and it can be an error source if i forgot one.
可以轻松调用，但不会自动启动。我必须在加载时手动调用它们，这很烦人，占用代码中的空格，如果我忘记了，它可能是一个错误源。
If you don't understand my explanations, here's an example :
如果你不明白我的解释，这里有一个例子：
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.
我的表单中有一个“体重”和一个“身高”字段，我需要计算 BMI（身体质量指数）。当页面加载时，重量和高度由数据库填充，然后我在一切准备就绪后启动计算。但后来，如果用户改变体重或身高，BMI 必须立即重新计算。最好的方法是什么？使用 jquery 或纯 JS，我不介意。
Thanks.
谢谢。
回答by Joseph
var reference = (function thename(){
//function body
return thename; //return the function itself to reference
}()); //auto-run
reference(); //call it again
reference(); //and again
Note that calling the function returns a reference to the function you just called.
请注意，调用该函数会返回对您刚刚调用的函数的引用。
var anotherReference = reference(); //anotherReference === reference
