如何在JavaScript中删除数组中的空元素?
是否有一种简单的方法,或者我需要循环并手动删除它们?
如何在JavaScript中删除数组中的空元素?
是否有一种简单的方法,或者我需要循环并手动删除它们?
当前回答
最简单的方法
[NaN,未定义,空,0,1,2,2000,无限].filter(布尔)
其他回答
var data = [null, 1,2,3];
var r = data.filter(function(i){ return i != null; })
console.log(r)
[1,2,3]
简单ES6
['a','b','',,,'w','b'].filter(v => v);
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);
如果使用库是一个选项,我知道underscore.js有一个名为compact()的函数http://documentcloud.github.com/underscore/它还有其他几个与数组和集合相关的有用函数。
以下是他们文档的摘录:
_.compact(数组)返回删除了所有错误值的数组副本。在JavaScript中,false、null、0、“”、undefined和NaN都是假的。_.compact([0,1,false,2,'',3]);=> [1, 2, 3]
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(","));