js时间字符串转时间戳

字符串形如：2016-06-20 10:41 转换为时间戳：

var date = "2016-06-20 10:41";
date = date.substring(0,19);    
date = date.replace(/-/g,"/"); 
var timestamp = new Date(date).getTime();
console.log(timestamp/1000)