How does jquery determine whether it is an array?

Jquery method to determine whether it is an array: use the [$.isArray()] function, which can determine whether the specified parameter is an array, the syntax format is [$.isArray(object)]; if the parameter object is specified If it is an array, it returns true, otherwise it returns false.

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The operating environment of this tutorial: windows7 system, jquery3.2.1 version , this method is suitable for all brands of computers.

Jquery method to determine whether it is an array:

Use isArray() to determine whether it is an array

JQuery has encapsulated isArray() to determine whether it is an array

$.isArray()The function is used to determine whether the specified parameter is an array; if the specified parameter is an array, it returns true, otherwise false is returned.

var arr = [1,3]; var bool = $.isArray(arr);//判断是否为数组 返回Boolean console.log(bool); //true

Supplement:js judgment method

instanceof judgment

var ary = [1,23,4]; console.log(ary instanceof Array); //true

Prototype chain method judgment

var ary = [1,23,4]; console.log(ary.__proto__.constructor==Array);//true console.log(ary.constructor==Array);//true 这两段代码是一样的

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