例

    let arr = [
     { date: '2018-01-06',SW: '90.95', LL: '136', XXSW: '80.22',CKLL: '500' },
     { date: '2018-01-06', SW: '164.95', LL: '137', XXSW: '99.22', CKLL: '93' },
     { date: '2018-01-07', SW: '176.95', LL: '236', XXSW: '99.22', CKLL: '93' },
     { date: '2018-01-07', SW: '178.95', LL: '236', XXSW: '99.22', CKLL: '93' },
     { date: '2018-01-07', SW: '182.95', LL: '236', XXSW: '99.22', CKLL: '93' },
     { date: '2018-01-08', SW: '187.95', LL: '366', XXSW: '99.22', CKLL: '93' },
     { date: '2018-01-09', SW: '197.95', LL: '466', XXSW: '99.22', CKLL: '93' }
   ]

上面的arr为数组对象，需要根据date进行拆分分类，同一天的要放在一个数组里面，可以用如下代码。

    let dataArr = [];
    arr.map(mapItem => {
      if (dataArr.length == 0) {
          dataArr.push({ date: mapItem.date, List: [mapItem] })
      } else {
         let res = dataArr.some(item=> {//判断相同日期，有就添加到当前项
          if (item.date == mapItem.date) {
            item.List.push(mapItem)
            return true
          }
        })
        if (!res) {//如果没找相同日期添加一个新对象
          dataArr.push({ date: mapItem.date, List: [mapItem] })
        }
      }
    })

最后dataArr变成

    dataArr = [
        {
            date:'2018-01-06',
            List: [
                { date: '2018-01-06', SW: '90.95', LL: '136', XXSW: '80.22', CKLL: '500' },
                { date: '2018-01-06', SW: '164.95', LL: '137', XXSW: '99.22', CKLL: '93' }
            ]
        },
        {
            date:'2018-01-07',
            List: [
                { date: '2018-01-07', SW: '176.95', LL: '236', XXSW: '99.22', CKLL: '93' },
                { date: '2018-01-07', SW: '178.95', LL: '236', XXSW: '99.22', CKLL: '93' },
                { date: '2018-01-07', SW: '182.95', LL: '236', XXSW: '99.22', CKLL: '93' },
            ]
        },
        {
            date:'2018-01-08',
            List: [
                 { date: '2018-01-08', SW: '187.95', LL: '366', XXSW: '99.22', CKLL: '93' },
            ]
        },
        {
            date:'2018-01-09',
            List: [
                { date: '2018-01-09', SW: '197.95', LL: '466', XXSW: '99.22', CKLL: '93' }
            ]
        }
    ]

点击生成n位随机数

<!DOCTYPE html>
<html>
<head>
    <title>点击input生成n位随机数</title>
</head>
<body>
    <input type="text" value="Test" id="Test" />
    <button id="btn">提交</button>
    <script>
        var jschars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
        function generateMixed(n) {//n代表生成随机数位数
            var res = "";
            for(var i = 0; i < n ; i ++) {
                var id = Math.ceil(Math.random()*35);
                res += jschars[id];
            }
            Test.value=res;
        }
        btn.onclick = function(){
            generateMixed(7) 
        } 
    </script>
</body>
</html>