js数组去空值

js数组去空值的几种方法。

for遍历

var arr = [1, 2, 3, '',, undefined, null,,];
var r = removeEmptyElem(arr);

function removeEmptyElem(rawArr) {
    let result = [];
    // 深拷贝
    for (let i = 0; i < rawArr.length; i++) {
        if (rawArr[i] !== undefined && rawArr[i] !== null && rawArr[i] !== '') {
            result.push(rawArr[i]);
        }
    }
    return result;
}

filter过滤

var arr = [1, 2, 3, '',, undefined, null,,];
var r = arr.filter(function(s) {
    return s;
});

splice切片

var arr = [1, 2, 3, '',, undefined, null,,];
spliceArr(arr);

function spliceArr(rawArr) {
    for (let i = 0; i < rawArr.length; i++) {
        if (rawArr[i] == undefined || rawArr[i] == null || rawArr[i] == '') {
            rawArr.splice(i, 1);
            i -= 1;
        }
    }
    return rawArr;
}