在JavaScript中实现Object.Assign（）的另一种方法

Question

Object.assign(home, action.home.fields);

I'm assigning action.home.fields to my home object. Found out that the Object.assign isn't supported in IE.

What's the equivalent to what I'm doing that's support in IE?

I read the spread operator ? So would:

home = {...home, ...action.home.fields};

work?

I did check the support on that, wasn't support massively either.

Answer 1

This is the not-so-official polyfill for Object.assign() :

if (typeof Object.assign != 'function') {
  (function () {
    Object.assign = function (target) {
      'use strict';
      // We must check against these specific cases.
      if (target === undefined || target === null) {
        throw new TypeError('Cannot convert undefined or null to object');
      }

      var output = Object(target);
      for (var index = 1; index < arguments.length; index++) {
        var source = arguments[index];
        if (source !== undefined && source !== null) {
          for (var nextKey in source) {
            if (source.hasOwnProperty(nextKey)) {
              output[nextKey] = source[nextKey];
            }
          }
        }
      }
      return output;
    };
  })();
}

Taken from MDN .