js new Date() 转换为 年-月-日 （单月/日自动补0）

 1 function getNowFormatDate() {
 2     var date = new Date();
 3     var seperator1 = "-";
 4     var year = date.getFullYear();
 5     var month = date.getMonth() + 1;
 6     var strDate = date.getDate();
 7     if (month >= 1 && month <= 9) {
 8         month = "0" + month;
 9     }
10     if (strDate >= 0 && strDate <= 9) {
11         strDate = "0" + strDate;
12     }
13     var currentdate = year + seperator1 + month + seperator1 + strDate;
14     return currentdate;
15 }
16 console.log(getNowFormatDate()) // 2019-07-09