javascript - 用JavaScript比较两个日期(Compare two dates with JavaScript)

Question

Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript?

(有人可以建议一种使用JavaScript比较两个大于，小于和过去的日期的值的方法吗？)

The values will be coming from text boxes.

(这些值将来自文本框。)

  ask by Alex translate from so

Answer 1

The Date object will do what you want - construct one for each date, then compare them using the > , < , <= or >= .

(Date对象将执行您想要的操作-为每个日期构造一个，然后使用> ， < ， <=或>= 。)

The == , != , === , and !== operators require you to use date.getTime() as in

(== ， != ， ===和!==运算符要求您使用date.getTime()如)

var d1 = new Date();
var d2 = new Date(d1);
var same = d1.getTime() === d2.getTime();
var notSame = d1.getTime() !== d2.getTime();

to be clear just checking for equality directly with the date objects won't work

(要清楚的是，仅直接检查日期对象是否相等将不起作用)

var d1 = new Date();
var d2 = new Date(d1);

console.log(d1 == d2);   // prints false (wrong!) 
console.log(d1 === d2);  // prints false (wrong!)
console.log(d1 != d2);   // prints true  (wrong!)
console.log(d1 !== d2);  // prints true  (wrong!)
console.log(d1.getTime() === d2.getTime()); // prints true (correct)

I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes, though, lest you find yourself in input validation hell.

(我建议您使用下拉列表或日期输入的某些类似约束形式，而不要使用文本框，以免使您陷入输入验证的困境。)