In JavaScript, the judgment variable is an array, function, or object type. _javascript Tips

Array

In ECMAScript5, Array.isarray is the primary method of judging arrays, IE9 and above support. With compatibility in mind, in browsers without this method, you can use Object.prototype.toString.call (obj) = = ' [Object Array] ' instead.

Copy Code code as follows:

var IsArray = Array.isarray | | function (obj) {
return Object.prototype.toString.call (obj) = = ' [Object Array] ';
}

Function

The simplest and best way to do this is to typeof obj = ' function '. Given the bugs that exist in some version browsers, the most plausible approach is Object.prototype.toString.call (obj) = = ' [Object Function] '.

Copy Code code as follows:

var isfunction = function (obj) {
return Object.prototype.toString.call (obj) = = ' [Object Function] ';
}
if (typeof/./!= ' function ' && typeof int8array ' object ') {
isfunction = function (obj) {
return typeof obj = = ' function ';
}
}

Object

Complex types are objects in JavaScript, and functions are objects. Using typeof for the above 2 people, you can get ' object ' and ' function ' respectively. In addition, the case of null values is excluded, because typeof null is also ' object '.

Copy Code code as follows:

var isobject = function (obj) {
var type = typeof obj;
return type = = ' function ' | | Type = = = ' object ' &&!! Obj
}

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