JS 根据数组对象属性值分类，把一个数组拆分为多个数组
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>
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