JS将YYYYMMDDHHMMSS格式化为YYYY-MM-DD HH:MM:SS

问题

将字符串YYYYMMddHHmmss格式化成YYYY-MM-DD hh:mm:ss

解决方案

dateStr(dateStr) {
    var pattern = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;
    //将时间格式化成 yyyy-MM-dd HH:mm:ss
    var formatDateStr = dateStr.replace(pattern, '$1-$2-$3 $4:$5:$6');
    return formatDateStr;
}

注意

用在vue中可能报以下错误

<template slot-scope="scope">
    {{dateStr(scope.row.createTime)}}
</template>

TypeError: Cannot read properties of undefined (reading 'replace')

原因：数据来源可能为空

解决方案

在数据的标签里面添加判断 v-if

<template slot-scope="scope">
    <span v-if="scope.row.createTime">
        {{dateStr(scope.row.createTime)}}
        </span>
</template>