js 操作数组（过滤对应数据）

一、过滤掉相应数据（带有key）

var fileList = {
        "85968439868a92": [{name: 'food.jpeg'}, {name: 'ood.jpeg'}],
        "15968439111111": [{name: 'd.jpeg'}, {name: 'doe.jpeg'}]
    };
    function demo() {
        Object.keys(fileList).forEach(function (k) {
            console.log(k)
            console.log(fileList[k])
            var f = fileList[k].filter(gl)
            console.log(f)
            fileList[k] = f
        })
        console.log(fileList)
    }
    function gl(ele) {
        console.log(1)
        console.log(ele)
        if (ele.name !== 'food.jpeg'){
            return ele
        }
    }
    demo()

 

二、过滤掉含有某些id 的数据

　　比如：如何去除数组a中 id=15和id=3 的对象

var a = [{ id: 15 }, { id: -1 }, { id: 0 }, { id: 3 }, { id: 12.2 }];
var b = [15, 3];
var c = a.filter(item => { return !b.includes(item.id); });

console.log(c)

 

三、过滤多维数组的相应数据

function f () {
    var treeData = [
      {a:'1',sub:[{aaa:'ggg',is_show: 0}]},
      {a:'hhh',sub:[{aaa:'rrr',is_show: 1}]},
    ]
    var a = JSON.parse(JSON.stringify(treeData)).map(item => {
      console.log(item)
      if (item.sub) {
        item.sub = item.sub.filter(sub => sub.is_show == 1)
      }
      return item;
    }).filter(item => item.sub && item.sub.length);
    console.log(a)
  }

 

四、筛选出对象中有值的数据

var query= {
      a1: "nn",
      a2: "",
      a3: "bb"
    }

    var a = Object.keys( query ).reduce( ( result, key ) => {
      if ( query[ key ] !== "" ) {
        result[ key ] = query[ key ];
      }
      return result;
    }, {} );
    console.log(a)