标签归档:jQuery

jQuery源码分析之数据类型判断方法——$.type()

无意中瞟到一眼jQuery源码发现type方法的代码怎么看着那么闹腾,于是乎研究了一下,虽然不知道其中原理,但是从此妈妈再也不担心我如何判断数据类型了。。。。

以前认为用typeof判断就ok了,想想真是图样图森破啊,请看示例:

typeof new Boolean(1)           = "object"
typeof new Number(1)            = "object"
typeof new String('a')          = "object"
typeof new function(){return 1} = "object"
typeof new Array('a','b')       = "object"
typeof new Date('Thu Jul 11 2013 11:51:31 GMT+0800(中国标准时间)') = "object"
typeof new RegExp(/a/)          = "object"

走到这突然发现尼玛怎么什么东西都是“object”,这不坑爹呢吗,最终翻来覆去研究jQuery源码曲奇精髓去其糟粕的总结出核心方法,请看示例:

Object.prototype.toString.call(new Boolean(1))        = "[object Boolean]"
Object.prototype.toString.call(true)                  = "[object Boolean]"
Object.prototype.toString.call(new Number(1))         = "[object Number]"
Object.prototype.toString.call(100)                   = "[object Number]"
Object.prototype.toString.call(new String("bbs0101")) = "[object String]"
Object.prototype.toString.call("bbs0101")             = "[object String]"
Object.prototype.toString.call(function(){return 1})  = "[object Function]"
Object.prototype.toString.call(new Array(1,2,3,4,5))  = "[object Array]"
Object.prototype.toString.call([1,2,3,4,5])           = "[object Array]"
Object.prototype.toString.call(new Date())            = "[object Date]"
Object.prototype.toString.call(new RegExp('bbs0101')) = "[object RegExp]"
Object.prototype.toString.call(/bbs0101/)             = "[object Regexp]"

走到这突然感觉豁然开朗,然开朗,开朗,朗。。。。。