js 获取昨天的日期

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js 获取昨天的日期

<script>
	function getDay(num, str) {
        var today = new Date();
        var nowTime = today.getTime();
        var ms = 24*3600*1000*num;
        today.setTime(parseInt(nowTime + ms));
        var oYear = today.getFullYear();
        var oMoth = (today.getMonth() + 1).toString();
        if (oMoth.length <= 1) oMoth = '0' + oMoth;
        var oDay = today.getDate().toString();
        if (oDay.length <= 1) oDay = '0' + oDay;
        return oYear + str + oMoth + str + oDay;
    }
    
	var yesterday = getDay(-1, '-');		//    -1 代表前一天，-2前两天...
	console.log(yesterday);

</script>

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