通过传递带有路径和值的字符串来扩展JavaScript对象 [英] Extend a JavaScript object by passing a string with the path and a value

问题描述

是否有通过传递字符串和值来扩展JavaScript对象的简便方法?

Is there an easy way to extend a JavaScript object by passing a string and a value?

基本上我需要这样的东西:

Basically I need something like this:

myObject = {}

var extendObj = function(obj, path, value){
}

var path = "a.b.c", value = "ciao";
extendObj(myObject, path, value);


console.log(myObject.a.b.c) //will print "ciao"

推荐答案

myObject = {};

var extendObj = function (obj, path, value) {
    var levels = path.split("."),
        i = 0;

    function createLevel(child) {
        var name = levels[i++];
        if(typeof child[name] !== "undefined" && child[name] !== null) {
            if(typeof child[name] !== "object" && typeof child[name] !== "function") {
                console.warn("Rewriting " + name);
                child[name] = {};
            }
        } else {
            child[name] = {};
        }
        if(i == levels.length) {
            child[name] = value;
        } else {
            createLevel(child[name]);
        }
    }
    createLevel(obj);
    return obj;
}

var path = "a.b.c",
    value = "ciao";
extendObj(myObject, path, value);


console.log(myObject.a.b.c) //will print "ciao"

http://jsfiddle.net/DerekL/AKB4Q/

您可以在控制台中看到它根据您输入的path创建路径.

You can see in the console that it creates the path according to path you entered.

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