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

'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

'use strict';

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