Object.prototype.toString.call() vs typeof

Posted on | In |

可以从下面例子找到答案：

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var toString = Object.prototype.toString;
var strLit = 'example';
var strStr = String('example')​;
var strObj = new String('example');
console.log(typeof strLit); // string    
console.log(typeof strStr); // string
console.log(typeof strObj); // object
console.log(strLit instanceof String); // false
console.log(strStr instanceof String); // false
console.log(strObj instanceof String); // true
console.log(toString.call(strLit)); // [object String]
console.log(toString.call(strStr)); // [object String]
console.log(toString.call(strObj)); // [object String]