使用JavaScript比较两个日期 [英] Compare two dates with JavaScript

问题描述

有人可以建议一种方法来比较两个日期的大于，小于和过去使用JavaScript的值？这些值将来自文本框。

Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes.

推荐答案

Date对象会做你想要的 - 为每个日期构建一个，然后使用> ，< ，< = 或> = 。

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

== ，！= ， === 和！== 运算符要求您使用 date.getTime code>

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

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

清楚只是检查直接相等的数据对象是否会工作

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

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)

我建议你使用下拉菜单或类似的约束形式的日期而不是文本框，以免您发现自己在输入验证地狱。

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.

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