1.普通数组
var arr=[1,1,2,3];
var newArr = [...new Set(arr)]; // 对原始数组去重
var list = [];
newArr.forEach(i => {
list.push(arr.filter(t => t === i))；
})
var mlist = [];
list.forEach((i, index) => {
mlist.push({
name: newArr[index],
num: i.length,
})
})
console.log(list, mlist) // mlist将以数组的形式输出结果，如下图
普通数组
2.对象数组
var arr=[{nam:'张三', age: '14'}, {nam:'李四', age: '16'}, {nam:'张三', age: '14'}, {nam:'赵武', age: '14'}];
var newArr = [...new Set(arr.map(i => i.nam))]; // 去重的时候需要注意和普通数组不同
console.log(newArr);
var list = [];
newArr.forEach(i => {
list.push(arr.filter(t => t.nam === i));
})
var mlist = [];
list.forEach((i, index) => {
mlist.push({
name: newArr[index],
num: i.length,
})
})
console.log(list, mlist);
对象数组
