如何通过键合并两个对象值

Question

尝试查看是否有任何JavaScript库功能可以合并两个json对象的特定键的值var x ={ "student-marks":{'math':1,'physics':5} };var y ={ "student-marks":{'chemistry':3,'history':2} };使用$ .extend和$ .merge给出以下结果$.extend({},x,y)  leads to  { "student-marks":{'chemistry':3,'history':2} }$.merge(x,y) leads to { "student-marks":{'math':1,'physics':2} }我正在寻找的是{ "student-marks":{'math':1,'physics':5, 'chemistry':3,'history':2} }‍

Answer 1

你想深入扩展

$.extend(true, {}, x, y);

请参阅jQuery.extend（[ deep ]，target，object1 [，objectN ]）的文档

Answer 2

不依赖jQuery的简单javascript函数将帮助您合并具有嵌套对象的两个JSON对象。

function mergeJSON(source1,source2){

    /*

     * Properties from the Souce1 object will be copied to Source2 Object.

     * Note: This method will return a new merged object, Source1 and Source2 original values will not be replaced.

     * */

    var mergedJSON = Object.create(source2);// Copying Source2 to a new Object

    for (var attrname in source1) {

        if(mergedJSON.hasOwnProperty(attrname)) {

          if ( source1[attrname]!=null && source1[attrname].constructor==Object ) {

              /*

               * Recursive call if the property is an object,

               * Iterate the object and set all properties of the inner object.

              */

              mergedJSON[attrname] = mergeJSON(source1[attrname], mergedJSON[attrname]);

          } 

        } else {//else copy the property from source1

            mergedJSON[attrname] = source1[attrname];

        }

      }

      return mergedJSON;

}