jQuery serializeObject based on serializeArray

jQueryThere is a method $.fn.serialize, which can serialize the form into a string; there is a method $.fn.serializeArray, which can serialize the form into an array.
If you need to serialize it into a JSON object, you can easily implement it by writing the method serializeObject based on serializeArray:

//work with jQuery 1.x
jQuery.prototype.serializeObject=function(){
	var obj=new Object();
	$.each(this.serializeArray(),function(index,param){
		if(!(param.name in obj)){
			obj[param.name]=param.value;
		}
	});
	return obj;
};

Note: When parameters with the same name appear in the form, serializeObject will take the first one and ignore the subsequent ones.

If

<form>
	<input type="text" name="username" />
	<input type="text" name="password" />
</form>

then

jQuery("form").serialize(); //"username=&password="
jQuery("form").serializeArray(); //[{name:"username",value:""},{name:"password",value:""}]
jQuery("form").serializeObject(); //{username:"",password:""}

20150125Update
==== =======
+ This version is no longer compatible with IE8
+ Fixed a logic error

//work with jQuery 2.x
jQuery.prototype.serializeObject=function(){
	var hasOwnProperty=Object.prototype.hasOwnProperty;
	return this.serializeArray().reduce(function(data,pair){
		if(!hasOwnProperty.call(data,pair.name)){
			data[pair.name]=pair.value;
		}
		return data;
	},{});
};

20150705 update
===========

+ Reduce method dependencies and expand the scope of compatibility
+ Switch to native loops to improve code performance

//work with jQuery Compact 3.x
jQuery.prototype.serializeObject=function(){
	var a,o,h,i,e;
	a=this.serializeArray();
	o={};
	h=o.hasOwnProperty;
	for(i=0;i<a.length;i++){
		e=a[i];
		if(!h.call(o,e.name)){
			o[e.name]=e.value;
		}
	}
	return o;
};

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