In the project, we often meet some requirements, that is, how to turn the time format into a format we want , Of course , You can use some third-party plug-ins, such as moment, This is what others have already packaged , If you want to be a thoughtful programmer , Not a porter , You have to understand js How to encapsulate a time format function , The code is as follows ：
function formatDate(value, fmt) { let getDate = new Date(value); let o = { 'M+'
: getDate.getMonth() + 1, 'd+': getDate.getDate(), 'h+': getDate.getHours(),
'm+': getDate.getMinutes(), 's+': getDate.getSeconds(), 'q+': Math.floor((
getDate.getMonth() + 3) / 3), 'S': getDate.getMilliseconds() }; if (/(y+)/.test(
fmt)) { fmt = fmt.replace(RegExp.$1, (getDate.getFullYear() + '').substr(4 -
RegExp.$1.length)); } for (let k in o) { if (new RegExp('(' + k + ')').test(fmt)
) { fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (('00' + o[
k]).substr(('' + o[k]).length))); } } return fmt; } let d = new Date(); console.
log(formatDate(d, 'yyyy-MM-dd')); // 2020-09-18 console.log(formatDate(d,
'yyyy:MM:dd')); // 2020:09:18 console.log(formatDate(d, 'yyyy-MM-dd hh:mm'));
// 2020-09-18 17:26
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