时间戳转换为日期格式

       var time = 1212432223
    
       this.changeDate(new Date(time*1000))



        changeDate(str) {
            return str.getFullYear()+'-'+this.checkNum(str.getMonth()+1)+'-'+this.checkNum(str.getDate())
        },
        checkNum(num) {
            if(num < 10) {
                return '0'+num
            }else {
                return num
            }
        }