我需要完成同样的任务，并遇到了这个线程。我最终使用数组“join”使用“_”分隔符创建字符串，然后使用正则表达式：-

1. replace "__" or more with just one "_",
2. replace preceding "_" with nothing "" and similarly 
3. replace and ending "_" with nothing ""

…然后使用数组“拆分”生成一个已清理的数组：-

var myArr = new Array("","","a","b","","c","","","","","","","","","e","");
var myStr = "";

myStr = myArr.join("_");

myStr = myStr.replace(new RegExp(/__*/g),"_");
myStr = myStr.replace(new RegExp(/^_/i),"");
myStr = myStr.replace(new RegExp(/_$/i),"");
myArr = myStr.split("_");

alert("myArr=" + myArr.join(","));

…或1行代码：-

var myArr = new Array("","","a","b","","c","","","","","","","","","e","");

myArr = myArr.join("_").replace(new RegExp(/__*/g),"_").replace(new RegExp(/^_/i),"").replace(new RegExp(/_$/i),"").split("_");

alert("myArr=" + myArr.join(","));

…或，扩展Array对象：-

Array.prototype.clean = function() {
  return this.join("_").replace(new RegExp(/__*/g),"_").replace(new RegExp(/^_/i),"").replace(new RegExp(/_$/i),"").split("_");
};

var myArr = new Array("","","a","b","","c","","","","","","","","","e","");

alert("myArr=" + myArr.clean().join(","));

删除空元素的最佳方法是使用Array.prototype.filter（），正如其他答案中已经提到的那样。

不幸的是，IE<9不支持Array.prototype.filter（）。如果您仍然需要支持IE8或更旧版本的IE，可以使用以下polyfill在这些浏览器中添加对Array.protocol.filter（）的支持：

if (!Array.prototype.filter) {
  Array.prototype.filter = function(fun/*, thisArg*/) {
    'use strict';
    if (this === void 0 || this === null) {
      throw new TypeError();
    }
    var t = Object(this);
    var len = t.length >>> 0;
    if (typeof fun !== 'function') {
      throw new TypeError();
    }
    var res = [];
    var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
    for (var i = 0; i < len; i++) {
      if (i in t) {
        var val = t[i];
        if (fun.call(thisArg, val, i, t)) {
          res.push(val);
        }
      }
    }
    return res;
  };
}

几个简单的方法：

var arr = [1,2,,3,,-3,null,,0,,undefined,4,,4,,5,,6,,,,];

arr.filter(n => n)
// [1, 2, 3, -3, 4, 4, 5, 6]

arr.filter(Number) 
// [1, 2, 3, -3, 4, 4, 5, 6]

arr.filter(Boolean) 
// [1, 2, 3, -3, 4, 4, 5, 6]

或-（仅适用于“text”类型的单个数组项）

['','1','2',3,,'4',,undefined,,,'5'].join('').split(''); 
// output:  ["1","2","3","4","5"]

或-经典方式：简单迭代

var arr = [1,2,null, undefined,3,,3,,,0,,,[],,{},,5,,6,,,,],
    len = arr.length, i;

for(i = 0; i < len; i++ )
    arr[i] && arr.push(arr[i]);  // copy non-empty values to the end of the array

arr.splice(0 , len);  // cut the array and leave only the non-empty values
// [1,2,3,3,[],Object{},5,6]

jQuery：

var arr = [1,2,,3,,3,,,0,,,4,,4,,5,,6,,,,];
    
arr = $.grep(arr, n => n == 0 || n);
// [1, 2, 3, 3, 0, 4, 4, 5, 6]

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

要移除孔，应使用

arr.filter(() => true)
arr.flat(0) // New in ES2019

对于删除孔、空和未定义：

arr.filter(x => x != null)

用于删除hole和falsy（null，undefined，0，-0，0n，NaN，“”，false，document.all）值：

arr.filter(x => x)

arr=[，null，（void 0），0，-0，0n，NaN，false，“”，42]；console.log（arr.filter（（）=>true））；//[null，（void 0），0，-0，0n，NaN，false，“”，42]console.log（arr.filter（x=>x！=null））；//[0，-0，0n，NaN，假，“”，42]console.log（arr.filter（x=>x））；//[42]

注：

孔是一些没有元素的数组索引。

arr = [, ,];
console.log(arr[0], 0 in arr, arr.length); // undefined, false, 2; arr[0] is a hole
arr[42] = 42;
console.log(arr[10], 10 in arr, arr.length); // undefined, false, 43; arr[10] is a hole

arr1 = [1, 2, 3];
arr1[0] = (void 0);
console.log(arr1[0], 0 in arr1); // undefined, true; a[0] is undefined, not a hole

arr2 = [1, 2, 3];
delete arr2[0]; // NEVER do this please
console.log(arr2[0], 0 in arr2, arr2.length); // undefined, false; a[0] is a hole

上述所有方法都返回给定数组的副本，而不是就地修改它。

arr = [1, 3, null, 4];
filtered = arr.filter(x => x != null);
console.log(filtered); // [1, 3, 4]
console.log(arr); // [1, 3, null, 4]; not modified