Question

我的问题是关于setintervall函数。当thrice()和first()执行完成时，我调用名为second()的函数。这没有问题。以下代码：

var oneFinish = false;
var twoFinish = false;

function first() {
    console.log("FUNCTION first RUNNING");
    for (i = 0; i < 5; i++) {
        console.log("first " + i);
    }
    console.log("FUNCTION first FINISH");
    oneFinish = true;
}

function second() {
    console.log("FUNCTION second RUNNING");
    for (i = 0; i < 10; i++) {
        console.log("second " + i);
    }
    console.log("FUNCTION second FINISH");
    twoFinish = true;
}

function thrice() {
    var intev = setInterval(function () {
        if (oneFinish && twoFinish) {
            console.log("FUNCTION thrice RUNNING");
            oneFinish = false;
            twoFinish = false;
            clearInterval(intev);
        }
    }, 3000);
    console.log("FUNCTION thrice FINISH");
}

first();
second();
thrice();

输出如下：

FUNCTION first RUNNING
first 0
first 1
first 2
first 3
first 4
FUNCTION first FINISH
FUNCTION second RUNNING
second 0
second 1
second 2
second 3
second 4
second 5
second 6
second 7
second 8
second 9
FUNCTION second FINISH
FUNCTION thrice FINISH
FUNCTION thrice RUNNING

您会看到输出的结束，问题FUNCTION thrice FINISH在FUNCTION thrice RUNNING之前执行

Answer 1

因为，setInterval中函数的所有内容都是在3000 milisec之后调用的。它的目标是setInterval：http://www.w3schools.com/jsref/met_win_setinterval.asp

var intev = setInterval(function () {
    if (oneFinish && twoFinish) {
        console.log("FUNCTION thrice RUNNING");
        oneFinish = false;
        twoFinish = false;
        clearInterval(intev);
    }
}, 3000);
console.log("FUNCTION thrice FINISH");

如果要修复订单，则必须将console.log("FUNCTION thrice FINISH");放入回调函数中：

var intev = setInterval(function () {
    if (oneFinish && twoFinish) {
        console.log("FUNCTION thrice RUNNING");
        oneFinish = false;
        twoFinish = false;
        clearInterval(intev);
        console.log("FUNCTION thrice FINISH");
    }
}, 3000);

Answer 2

那是因为您在3秒后开始登录，但是您立即记录结束。试试这个：

function thrice() {
    var intev = setInterval(function () {
        if (oneFinish && twoFinish) {
            console.log("FUNCTION thrice RUNNING");
            oneFinish = false;
            twoFinish = false;
            clearInterval(intev);
            console.log("FUNCTION thrice FINISH");
        }
    }, 3000);
}

Javascript停止间隔和后续操作

2 个答案: