常用时间转换

        //获取当前时间戳
        let a = Date.now();
        console.log('a',a);

        //获取当前时间戳
        let b = new Date().getTime();
        console.log('b',b);

        //年月日时分秒生成时间对象
        let c = new Date(2018,7,25,14,20,22).getTime();
        console.log('c',c);

        //年月日生成时间对象
        let d = new Date(2018,7,25);
        console.log('d',d);

        //年月日时分生成时间对象
        let e = new Date(2018,7,25,6,45);
        console.log('e',e);

         // new Date(年，月，日，时，分，秒,毫秒);
         let f1 = new Date(2018,7,25,14,0,0,900).getTime();
         let f2 = new Date(2018,7,25,14,0,0).getTime();
         console.log(f1,f2);

         //时间戳转时间对象
         let g = new Date(1535176800900);
         console.log('g',g);