JavaScript函数队列 [英] JavaScript Function Queue
本文介绍了JavaScript函数队列的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有很多需要连续运行的功能,但是在其他功能完成之前没有。我需要的是一种方法,将这些函数排队,只有在上一个函数成功完成后才能运行。有什么想法吗?
I have a ton of functions that need to run in succession, but not before the other has completed. What I need is a way to queue these functions to run only after the previous function was successfully completed. Any Ideas?
Function1();
Function2();
Function3();
Function4();
Function5();
推荐答案
您可以使用以下内容:
var FunctionQueue = (function(){
var queue = [];
var add = function(fnc){
queue.push(fnc);
};
var goNext = function(){
var fnc = queue.shift();
fnc();
};
return {
add:add,
goNext:goNext
};
}());
并像这样使用:
var fnc1 = function(){
window.setTimeout(function(){
alert("1 done");
FunctionQueue.goNext();
}, 1000);
};
var fnc2 = function(){
window.setTimeout(function(){
alert("2 done");
FunctionQueue.goNext();
}, 5000);
};
var fnc3 = function(){
window.setTimeout(function(){
alert("3 done");
FunctionQueue.goNext();
}, 2000);
};
FunctionQueue.add(fnc1);
FunctionQueue.add(fnc2);
FunctionQueue.add(fnc3);
FunctionQueue.goNext();
几年后编辑:
人们接近这个的另一种方式是传入 next
可以调用以继续链的函数。像这样:
Edit after a few years:
Another way people are approaching this is to pass in a next
function that you can call to continue the chain. Like so:
var Queue = function(arr){
var index = 0;
var next = function(){
if (index >= arr.length) {return;}
arr[index++](next);
};
return next;
};
var fn1 = function(next){
console.log("I am FN1");
next();
};
var fn2 = function(next){
console.log("I am FN2");
setTimeout(next,1000);
};
var fn3 = function(next){
console.log("I am FN3");
setTimeout(next,3000);
};
var fn4 = function(next){
console.log("I am FN4");
setTimeout(next,1000);
};
Queue([fn1, fn2, fn3, fn4])();
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