<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
//普通数组
var arr = [1,2,3,3,2,1,1,2,3];
var obj = {};
arr.forEach(item=>{
obj[item] = item;
});//利用对象去重
console.log(obj);
for(var o in obj){
obj[o] = []
}
console.log(obj);
//上面两步可以简写为下面一个步骤
/*arr.forEach((item)=>{
obj[item] = [];
})*/
//将数组中相同的元素放入同一个数组
arr.forEach(item=>{
console.log(item);
for(var o in obj){
if(item==o){
obj[o].push(item);
}
}
});
console.log(obj);
//如果是比较复杂的数据，下面以数组对象为例，subId相同的分为一组
var datas = JSON.parse(JSON.stringify({"datas": [{
"pId": "2211380240034753",
"subId": "-7629697887759678641",
"logType": "1",
"date": "2021-07-02"
}, {
"pId": "2211380240034753",
"subId": "-7629697887759678641",
"logType": "1",
"date": "2021-07-02"
}, {
"pId": "2211380240034753",
"subId": "278923639442458524",
"logType": "1",
"date": "2021-07-02"
}, {
"pId": "2211380240034753",
"subId": "278923639442458524",
"logType": "1",
"date": "2021-07-02"
}, {
"pId": "2211380240034753",
"subId": "278923639442458524",
"logType": "1",
"date": "2021-07-02"
}, {
"pId": "2211380240034753",
"subId": "-7629697887759678641",
"logType": "1",
"date": "2021-07-02"
}]}));
console.log(datas);
var obj1 = {};
datas.datas.forEach(item=>{
obj1[item.subId] = [];
});
console.log(obj1);
datas.datas.forEach(item=>{
for(let o in obj1){
if(item.subId==o){
obj1[o].push(item);
}
}
});
console.log(obj1);
var arrObj = [];
let i=0;
for(let o in obj1){
arrObj[i] = {};
arrObj[i].name = '文本';
arrObj[i].display = 'haha';
arrObj[i].newValue = '文本1';
arrObj[i].oldValue = '文本';
arrObj[i].children = obj1[o];
i++;
}
console.log(arrObj);
</script>
</head>
<body>
</body>
</html>
以上代码运行的最终结果如下
