JS获取本周、本季度、本月、上月的开始日期、结束日期
    
 
 
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var now = new Date(); 
 
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var nowDayOfWeek = now.getDay(); 
 
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var nowDay = now.getDate(); 
 
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var nowMonth = now.getMonth(); 
 
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var nowYear = now.getYear(); 
 
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nowYear += (nowYear < 2000) ? 1900 : 0; 
 
 
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var lastMonthDate = new Date(); 
 
- lastMonthDate.setDate(1); 
 
- lastMonthDate.setMonth(lastMonthDate.getMonth()-1); 
 
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var lastYear = lastMonthDate.getYear(); 
 
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var lastMonth = lastMonthDate.getMonth(); 
 
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function formatDate(date) { 
 
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var myyear = date.getFullYear(); 
 
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var mymonth = date.getMonth()+1; 
 
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var myweekday = date.getDate(); 
 
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if(mymonth < 10){ 
 
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mymonth = "0" + mymonth; 
 
- } 
 
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if(myweekday < 10){ 
 
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myweekday = "0" + myweekday; 
 
- } 
 
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return (myyear+