A brief discussion on the extend function in jquery

This article mainly talks about the specific steps and related operation skills of the extend function in jquery. Friends in need can refer to it. I hope it can help everyone.

extend function in jquery

jQuery.extend() function is used to extend one or more The object's contents are merged into the target object.

Note: 1. If only one parameter is specified for $.extend(), it means that the parameter target is omitted. At this point, the target is the jQuery object itself. In this way we can add new functions to the global object jQuery.

        2. If multiple objects have the same properties, the latter will overwrite the former’s property values.

Syntax

$.extend( target [, object1 ] [, objectN ] )
Indicates whether Deep merge

##$.extend( [deep ], target, object1 [, objectN ] )

##deepOptional. Boolean type indicates whether to merge objects deeply. The default is false. If this value is true, and a property with the same name in multiple objects is also an object, the properties of the "property object" will also be merged. targetObject type Target object, the member properties of other objects will be attached to this object. object1Object type The first object to be merged. objectNObject type The Nth merged object.

Parameter	Description

eg:

<span style="font-size: 14px;">var resultA=$.extend({},{name:"A",age:21},{name:"B",sex:"Boy"})<br/>resultA={name:"B",age:21,sex:"Boy"}var resultB=$.extend( true, {}, <br/>{ name: "A", location: {city: "beijing",county:"us"} }, <br/>{ last: "B", location: {state: "shanghai",county:"China"} } );<br/>resultB{name:"A",last:"B",location{city:"beijing",state:"shanghai",county:"China"}}var resultC=$.extend( false, {}, <br/>{ name: "A", location: {city: "beijing",county:"us"} }, <br/>{ last: "B", location: {state: "shanghai",county:"China"} } );<br/>resultC = {name:"A",last:"B",location:{state:"shanghai",county:"China"}}</span>

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