JS-就当前时间往前推49天、30天、7天、3天的日期

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function getData(day){     var today=new Date()     var targetday=today.getTime() +1000*60*60*24* day     today.setTime(targetday)     var tYear=today.getFullYear()     var tMonth=today.getMonth()     var tDate=today.getDate()     tMonth=this.doHandMonth(tMonth+1)     tDate=this.doHandMonth(tDate)     return tYear +"-" + tMonth+"-"+tDate }       function doHandMonth(month){     var m=month     if(month.toString().length==1){     m="0"+month     }     return m } console.log("前推49天:",getData(-49)) console.log("前推30天:",getData(-30)) console.log("前推7天:",getData(-7)) console.log("前推3天:",getData(-3))