new Date时间戳格式-转换yyyy-MM-dd

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formatDate(date) {   var year = date.getFullYear()   var month = this.format(date.getMonth() + 1)   var da = this.format(date.getDate())   // var h = this.format(date.getHours())   // var m = this.format(date.getMinutes())   // var s = this.format(date.getSeconds())   // return year + '-' + month + '-' + da + ' ' + h + ':' + m + ':' + s   return year + '-' + month + '-' + da }, format(val) {   return Number(val) < 10 ? '0' + val : '' + val },