var arr1 = [
            {name: "fcf294131", key: "处理进度", value: "等待处理"},
            {name: "fcf294131", key: "处理进度", value: "正在处理"},
            {name: "fcf294131", key: "处理进度", value: "等待处理"},
            {name: "fcf294131", key: "处理进度", value: "完成"},
            {name: "fcf294131", key: "处理进度", value: "等待处理"}
        ];
        var arr2 = arr1.reduce((all,a)=>{
    if(all[a.value]){
        all[a.value]++
    }else {
        all[a.value]=1
    }
    return all;

},[]);
console.log(arr2);//[等待处理: 3, 正在处理: 1, 完成: 1]
请问这是数组吗？
如何变为这样


  [
        {key:"等待处理",len:3},
        {key:"正在处理",len:1},
        {key:"完成",len:1}
    ]