标签：判断 变量 Object 数据类型 object toString call prototype
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调用Object.prototype.toString.call()方法
Object.prototype.toString.call('1')
'[object String]'
Object.prototype.toString.call(1)
'[object Number]'
Object.prototype.toString.call(undefined)
'[object Undefined]'
Object.prototype.toString.call(null)
'[object Null]'
Object.prototype.toString.call({})
'[object Object]'
Object.prototype.toString.call([])
'[object Array]'
标签：判断,
变量,
Object,
数据类型,
object,
toString,
call,
prototype
From： https://www.cnblogs.com/czwhandsome/p/16879930.html