How jquery determines whether it is its object

Jquery's method to determine whether it is its object: To determine whether an object is a jQuery object, you can use obj instanceof jQuery, the code is [if(obj instanceof jQuery){alert("This is a jQuery object");} 】.

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

Recommended: jquery video tutorial

Jquery’s method of judging whether it is its object:

When we are using jquery When doing loop traversal, each often uses this

, and sometimes we don’t know what this refers to, because in order to use the jquery method, the object must be a jquery object. .

In addition, to determine the type of a JavaScript object, you can use typeof,

But typeof can only determine the basic object of js(string,boolean,number,object)

To determine whether an object is a jquery object, you can use obj instanceof jQuery

For example:

var obj = $("div");
if(obj instanceof jQuery){
     alert("这是一个jQuery对象");
}else{
     alert("这是一个其它对象")
}
$(".otherWeek").each(function(){
     console.info(this instanceof jQuery);  //false
     console.info($(this) instanceof jQuery);  //true
})

Related free learning Recommended: javascript(Video)

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