Use javascript to control the effective time and display the time that is about to expire_javascript skills

A JavaScript implementation for setting the time and validity period. When I implemented it using jQuery, I felt that the code was too succinct. This is a piece of js code written by a colleague. I studied and studied it myself

Copy code The code is as follows:

< ;head>

>                                                                                                                                "2">Within three days
span class ="postAction">Will expire

after 2012-9-28 ;script type="text/javascript">

document.getElementById('date_sel').onchange = function(){
var time = new Date();
var pre_year = time.getFullYear();
var pre_month = time.getMonth (); var Pre_day = time.getdate ();
var sel_Day = PARSEINT (document.getelementByid ('date_sel'). Value); : Pre_Day =1;break;
case 1: pre_day =2;break;
case 2: pre_day =3;break;
case 3: pre_day =4;break;
default:pre_day =1; break;}

var endtime = new Date(pre_year, pre_month, pre_day);
document.getElementById('lastdate').innerHTML = endtime.getFullYear() "-" (endtime.getMonth() 1) "-" endtime.getDate();
};

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