字典的Javascript排序数组，按字母顺序排列，可能有null值

问题描述

我遇到了一个问题.我正在按联系人的名字对联系人进行排序，但是有时我碰到缺少名字的联系人.有谁知道如何更改此方法以使其起作用?谢谢

I am running into an issue. I am sorting contacts by their first name but sometimes I run into a contact that is missing the first name. Does anyone know how to change this method to make it work? Thanks

这是我正在使用的排序方法.

This is the sorting method I am using.

function sortAZ(ob1,ob2) {
    var n1 = ob1.firstName.toLowerCase()
    var n2 = ob2.firstName.toLowerCase()
    if (n1 > n2) {return 1}
    else if (n1 < n2){return -1}
    else { return 0}//nothing to split
};

data.sort(sortAZ);

推荐答案

function sortAZ(ob1,ob2) {
    // Handles case they're both equal (or both missing)
    if (obj1 == obj2) {return 0}
    // Handle case one is missing
    if (obj2 == null|| obj2 == "") {return 1}
    if (obj1 == null|| obj1 == "") {return -1}

    var n1 = ob1.firstName.toLowerCase()
    var n2 = ob2.firstName.toLowerCase()
    if (n1 > n2) {return 1}
    else if (n1 < n2){return -1}
    else { return 0}//nothing to split
};

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