JS基础——数据类型判断typeof、instanceof、Object.prototype.toString
栏目: JavaScript · 发布时间: 7年前
内容简介：对应测试结果如下：
typeof instanceof Object.prototype.toString
对应测试结果如下：
typeof test
|
instanceof
|
Object.prototype.toString.call(test)
|
|
| var test = 'xuriliang'; | string |
test instanceof String //false
|
[object String] |
| var test = 27; | number |
test instanceof Number //false
|
[object Number] |
| var test = true; | boolean |
test instanceof Boolean //false
|
[object Boolean] |
| var test = [1,2,3]; | object |
test instanceof Array //true
|
[object Array] |
test instanceof Object //true
|
|||
| var test = null; | object |
test instanceof Object //false
|
[object Null] |
| var test = undefined; | undefined |
test instanceof Object //false
|
[object Undefined] |
| var test = new String('xuriliang') | object |
test instanceof String //true
|
[object String] |
test instanceof Object //true
|
|||
| var test = new Number(27) | object |
test instanceof Number //true
|
[object Number] |
test instanceof Object //true
|
|||
| var test = new Boolean(true) | object |
test instanceof Boolean //true
|
[object Boolean] |
test instanceof Object //true
|
|||
| var test = new Array(1,2,3) | object |
test instanceof Array //true
|
[object Array] |
test instanceof Object //true
|
|||
| var test = function(){} | function |
test instanceof Function //true
|
[object Function] |
test instanceof Object //true
|
|||
| var test = /d/ | object |
test instanceof RegExp //true
|
[object RegExp] |
test instanceof Object //true
|
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