javascript - 使用数组值创建嵌套对象

Question

我有一组键:

var keys = ['key1', 'key2', 'key3'];

如何以最简单的方式创建这样的对象？

var object = { 'key1' : { 'key2' : {'key3' : 'value' }}}

Answer 1

您可以利用 JavaScript 存储 Object 引用这一事实:

var keys = ['key1', 'key2', 'key3']; // input data
var object = {};                     // output data
var current = object;                // we will use this to recursively insert
                                     // a new object

for(var i = 0; i < keys.length; i++) { // iterate through input data

    if(i === keys.length - 1) {    

        current[keys[i]] = 'value'; // if it's the last element, insert 'value'
                                    // instead of a new object

    } else {

        current[keys[i]] = {};      // otherwise insert a new element in the
                                    // current object with key of 'key1' etc
                                    // (from input data)

        current = current[keys[i]]; // set current object to this one, so that
                                    // next time it will insert an object into
                                    // this newly created one

    }

}