Question

我有这样的陈述：

// this is a date I select from input field and set its time to 12AM
var date = new Date(new Date().setHours(0, 0, 0, 0));
console.log(date);
var currentDate = new Date();
console.log(currentDate);

if (date.getTime() === new Date(currentDate.setHours(0, 0, 0, 0)).getTime() && currentDate.getTime() > (new Date(currentDate.setHours(11,30,0,0)).getTime())) {
            console.log("It works!!!");
}
else{
console.log("That didn't work as expected :(");
}

我不知道为什么它不起作用。当我在IF语句中单独检查每个比较时，它可以工作但是和＆amp;＆amp;不是。

这里有什么问题？

Answer 1

＆＃13;

systemdict | globaldict | userdict

＆＃13;

这就是为什么，＆＃34;那并没有像预期的那样发挥作用：（＆＃34;

Answer 2

最后，经过一些有趣的调试，我找到了你的问题。

这一行，

date.getTime() === new Date(currentDate.setHours(0, 0, 0, 0)).getTime() 在你的第一个条件正在改变你上面采用的当前日期变量，使用代码currentDate.setHours(0, 0, 0, 0)，这是第二个意图失败。

所以，如果你拿它们两个都不行，

以下是无效代码段的示例。

var date = new Date(new Date().setHours(0, 0, 0, 0));
console.log(date);
var currentDate = new Date();

if(date.getTime() === new Date(currentDate.setHours(0, 0, 0, 0)).getTime() && currentDate.getTime() > (new Date(currentDate.setHours(11,30,0,0)).getTime())) {
    console.log("It works!!!");
}
else{
	console.log("That didn't work as expected :(");
}

现在，查看工作代码段

    // this is a date I select from input field and set its time to 12AM
    var date = new Date(new Date().setHours(0, 0, 0, 0));
    console.log(date);
    var currentDate = new Date();
    
    if(date.getTime() === new Date(new Date().setHours(0, 0, 0, 0)).getTime() && currentDate.getTime() > (new Date(currentDate.setHours(11,30,0,0)).getTime())) {
    
                console.log("It works!!!");
    }
    else{
      console.log("That didn't work as expected :(");
    }

我已经采取了，

new Date().setHours(0, 0, 0, 0)).getTime() 代替

currentDate.setHours(0, 0, 0, 0)).getTime()这样，currentDate在第一个条件中不会被修改。

Answer 3

这个怎么样：

var date = new Date();
var today1130 = new Date(new Date().setHours(11,30));

console.log("input date is today: ", date.toDateString() === today1130.toDateString());
console.log("input date is after today 11:30: ", date > today1130);

Answer 4

我认为它之所以不起作用，是因为在上午11:30到中午12:00之间的时间错误计算。试试这个让我知道:)）

var todaysNoon = new Date();
var nextNoon = new Date();

todaysNoon.setHours(11,30,0,0);
if (todaysNoon <= nextNoon){ nextNoon.setDate(nextNoon.getDate()+1); }
nextNoon.setHours(11,30,0,0);

if (todaysNoon.getTime() <= new Date(nextNoon.setHours(0, 0, 0, 0)).getTime() && todaysNoon.getTime() <= new Date(nextNoon.setHours(0, 0, 0, 0)).getTime()) {
    console.log("It works!!!");
} else {
    console.log("That didn't work as expected :(");
}

希望这有帮助。

带有AND和日期的JavaScript if语句

4 个答案: