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JS获取日期相差天数的方法

var s1 = '2016-05-12';

s1 = new Date(s1.replace(/-/g, "/"));

s2 = new Date();//当前日期:2017-04-24

var days = s2.getTime() - s1.getTime();

var time = parseInt(days / (1000 * 60 * 60 * 24));

document.write(time);