将某个值转换为String类型 1. value.toString() toString()方法返回一个表示该对象的字符串 var a = 123 a.toString() // '123' 2. "" + value 一元加法运算符的作用是数值求和,或者字符串拼接.有字符串,则是字符串拼接.其他是数字相加求和. var a = 123 '' + a // '123' 3. String(value) String函数将其他值转换为字符串 var a = 123 String(a) /…
本文首发于个人博客https://kezunlin.me/post/107cbcbb/,欢迎阅读! using boost.date_time to get time in millisecond microsecond level Guide format flags second millisecond microsecond nanosecond Format Flags %f Fractional seconds are always used, even when their valu…