Safari TypeError：“未定义”不是函数（正在评估“Object.assign(...)”）

Question

我想通过 Javascript Object.assign() 将一些对象分配给目标对象。它在 chrome 中运行良好。在 safari 虽然我得到一个错误。

TypeError: 'undefined' is not a function (evaluating 'Object.assign(wkObj,tObj,list)')

对象

    var list = {'width':'100px'};
    var tz = "translateZ(-18px)";
    var tObj = {'transform': tz};
    var wkObj = {'-webkit-transform': tz};

Answer 1

safari 不支持，但你可以随时创建一个 polyfill：

if (!Object.assign) {
  Object.defineProperty(Object, 'assign', {
    enumerable: false,
    configurable: true,
    writable: true,
    value: function(target, firstSource) {
      'use strict';
      if (target === undefined || target === null) {
        throw new TypeError('Cannot convert first argument to object');
      }

      var to = Object(target);
      for (var i = 1; i < arguments.length; i++) {
        var nextSource = arguments[i];
        if (nextSource === undefined || nextSource === null) {
          continue;
        }

        var keysArray = Object.keys(Object(nextSource));
        for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
          var nextKey = keysArray[nextIndex];
          var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
          if (desc !== undefined && desc.enumerable) {
            to[nextKey] = nextSource[nextKey];
          }
        }
      }
      return to;
    }
  });
}

或者开始使用像Babel这样的转译器

Reference for polyfill