简单JS 数组扁平化

let arr2 = [{
        name: '张三',
        age: '57'
    },{
        name: '李四',
        age: 24
    },[{
        name: '沈大',
        age: 42
    },[{
        name: '王五',
        age: 74
    },{
        name: '赵六',
        age: 82
    }]]]

function flatten(arr) {
        return arr.reduce((result,item)=>{
            return result.concat(Array.isArray(item) ? flatten(item) : item);
        },[]);
    }
    

    console.log('reduce方法:', flatten(arr2))