JS intercepts the first few digits of the string or the last few digits of the string

      The time when you often encounter backstage reaction is ‘2020-02-02 10:00:00’, The page needs to display only the year, month and day or only the hour, minute and second , The simplest way is to intercept the returned value directly .

How to intercept the first few , The case is as follows

var date = '1996-10-22 22:55:33';
var key = date.substring(0,10);
console.log(key);
//  Print the results ：1996-10-22

How to intercept the last few bits , The case is as follows

var date = '1996-10-22 22:55:33';
var dateLength = disName.length;
var key = disName.substring(dateLength-8,dateLength);
console.log(key);
//  Print the results ：22:55:33

summary ：

    substring(a,b);

    a It means starting from the number of ,

    b Indicates the end of the order ,

    Understood from a Intercept to b .

Look at the address ：js How to intercept the first few digits of a string ？js How to intercept the last few bits of a string ？     The time when you often encounter backstage reaction is ‘2020-02-0210:00:00’, The page needs to display only the year, month and day or only the hour, minute and second , The simplest way is to intercept the returned value directly . How to intercept the first few , The case is as follows var date =..., Share blog http://sharedbk.com/post/236.html