时间格式化方法，输出格式：2019-06-20 11:30:50

formatDateTime(date){ let y = date.getFullYear(); let m = date.getMonth() + 1; m = m < 10 ? ('0' + m) : m; let d = date.getDate(); d = d < 10 ? ('0' + d) : d; let h = date.getH

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