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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Errors/Cant_assign_to_property below:

TypeError: can't assign to property "x" on "y": not an object - JavaScript

TypeError: can't assign to property "x" on {y}: not an object (Firefox)
TypeError: Cannot create property 'x' on {y} (Chrome)

TypeError.

在 Strict_mode下，当试图给一个symbol,string,number或者一个boolean类型的数据创建一个属性时就会报 TypeError, 任何 Primitive 值都不允许有property.

这个问题可能是由一个错误的值被放在了一个错误的地方导致的，或者预期String或Number的对象变体

"use strict";

var foo = "my string";
// 下面这行代码在非严格模式下不会执行。
foo.bar = {}; // TypeError: can't assign to property "bar" on "my string": not an object

有两种方式，第一种修复这部分代码阻止primitive被用于这种情况，或者可以通过使用对象构造器创建来修复。

"use strict";

var foo = new String("my string");
foo.bar = {};

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