How to determine whether an object is a jquery object

Method to determine whether an object is a jQuery object: You can use the obj instanceof jQuery method to determine, the code is [if (obj instanceof jQuery){alert("This is a jQuery object");}].

The operating environment of this tutorial: Windows 7 system, jquery version 3.2.1. This method is suitable for all brands of computers.

Method to determine whether an object is a jquery object:

When we use jquery's each to do loop traversal, we often use this, and sometimes we I don’t know what this refers to, because to use jquery’s method, this 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

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")
}
 
obj.each(function() {
    console.log(this instanceof jQuery); //false
    console.log($(this) instanceof jQuery); //true
})

Others:

• ##$(this)[0]

• $(this).get(0)

• $(this).toArray()[0];

The above three writing methods are equivalent

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JavaScript (video)

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