var a = [{a1: 1, children: [{a1: 2}, undefined, {a1: 3}]}, undefined, {a1: 5}, undefined, {a1: 6}]
function removeNilItemInArray(arr) {
    if (!arr || !arr.length) return;
    for (let i = 0; i < arr.length; i++) {
        if (!arr[i]) {
            arr.splice(i , 1);
            continue;
        }
        removeNilItemInArray(arr[i].children);
    }
}
var b = a;
removeNilItemInArray(a);
// Always keep this memory zone
console.log(b);

如果需要删除所有空值（“”、null、undefined和0）：

arr = arr.filter(function(e){return e}); 

要删除空值和换行符，请执行以下操作：

arr = arr.filter(function(e){ return e.replace(/(\r\n|\n|\r)/gm,"")});

例子：

arr = ["hello",0,"",null,undefined,1,100," "]  
arr.filter(function(e){return e});

返回：

["hello", 1, 100, " "]

更新（基于Alnitak的评论）

在某些情况下，您可能希望在数组中保留“0”并删除其他任何内容（null、undefined和“”），这是一种方法：

arr.filter(function(e){ return e === 0 || e });

返回：

["hello", 0, 1, 100, " "]

试试这个。将数组传递给它，它将返回并删除空元素*更新以解决Jason指出的错误

function removeEmptyElem(ary) {
    for (var i = ary.length - 1; i >= 0; i--) {
        if (ary[i] == undefined)  {
            ary.splice(i, 1);
        }       
    }
    return ary;
}

如果有人想要清理整个阵列或对象，这可能会有所帮助。

var qwerty = {
    test1: null,
    test2: 'somestring',
    test3: 3,
    test4: {},
    test5: {
        foo: "bar"
    },
    test6: "",
    test7: undefined,
    test8: " ",
    test9: true,
    test10: [],
    test11: ["77","88"],
    test12: {
        foo: "foo",
        bar: {
            foo: "q",
            bar: {
                foo:4,
                bar:{}
            }
        },
        bob: {}
    }
}

var asdfg = [,,"", " ", "yyyy", 78, null, undefined,true, {}, {x:6}, [], [2,3,5]];

function clean_data(obj) {
    for (var key in obj) {
        // Delete null, undefined, "", " "
        if (obj[key] === null || obj[key] === undefined || obj[key] === "" || obj[key] === " ") {
            delete obj[key];
        }
        // Delete empty object
        // Note : typeof Array is also object
        if (typeof obj[key] === 'object' && Object.keys(obj[key]).length <= 0) {
            delete obj[key];
        }
        // If non empty object call function again
        if(typeof obj[key] === 'object'){
            clean_data(obj[key]);
        }
    }
    return obj;
}

var objData = clean_data(qwerty);
console.log(objData);
var arrayData = clean_data(asdfg);
console.log(arrayData);

输出：

删除任何null、undefined、“”、“”空对象或空数组

jsfiddle在这里

这可能会帮助您：https://lodash.com/docs/4.17.4#remove

var details = [
            {
                reference: 'ref-1',
                description: 'desc-1',
                price: 1
            }, {
                reference: '',
                description: '',
                price: ''
            }, {
                reference: 'ref-2',
                description: 'desc-2',
                price: 200
            }, {
                reference: 'ref-3',
                description: 'desc-3',
                price: 3
            }, {
                reference: '',
                description: '',
                price: ''
            }
        ];

        scope.removeEmptyDetails(details);
        expect(details.length).toEqual(3);

scope.removeEmptyDetails = function(details){
            _.remove(details, function(detail){
                return (_.isEmpty(detail.reference) && _.isEmpty(detail.description) && _.isEmpty(detail.price));
            });
        };

只需一个衬垫：

[1, false, "", undefined, 2].filter(Boolean); // [1, 2]

或使用underscorejs.org：

_.filter([1, false, "", undefined, 2], Boolean); // [1, 2]
// or even:
_.compact([1, false, "", undefined, 2]); // [1, 2]