A JavaScript function parses URL parameters into Json objects_javascript skills

Question: Please write a JavaScript function parseQueryString, which is used to parse URL parameters into an object.
eg: var obj=parseQueryString(url);

Three forms of creating objects:
1:

var Person=new Object();
Person.name="Sun";
Person.age=24;

Two:

var Person=new Object();
Person["name"]="Sun";
Person["age"]=24;

Three:
Object literal expression

var Person={
name: "Sun",
age: 24
}

PS:
1. In this example, it is more suitable to use the second form, adding elements
to obj 2. split("&"), if the url has only one parameter and there is no "&", no error will be reported, and only array[0]

will be returned.

function parseQueryString(url)
{
var obj={};
var keyvalue=[];
var key="",value=""; 
var paraString=url.substring(url.indexOf("?")+1,url.length).split("&");
for(var i in paraString)
{
keyvalue=paraString[i].split("=");
key=keyvalue[0];
value=keyvalue[1];
obj[key]=value; 
} 
return obj;
}