Implement code through regular formatted url query string_javascript skills

I saw that the query string was formatted through the js array split method in the project, and I suddenly wondered why I couldn't use regular expressions. How is the performance? So we have the following code:

Copy code The code is as follows:

var url='www .baidu.com?a=123&b=456&c=789&e=dfsdfsdfsdfsdfsdfsdf&f=46545454545454785&g=e23232dsfvdfvdf';
/**
* Formatted query string (regular implementation)
* @param url url address
* @return {Object} Formatted json object
*/
function formatUrl(url){
var reg=/(?: [?&] )([^&] )=([^&] )/g;
var data={};
function fn(str,pro,value){
data[decodeURIComponent( pro)]=decodeURIComponent(value);
}
url.replace(reg,fn);
return data;
}
/**
* Formatted query string (array implementation)
* @param url url address
* @return {Object} Formatted json object
*/
function formatUrl2(url){
url=url.replace(/.*?/,'');
var args={},
items=url.length?url.split("&") :[]
,item=null
,i=0
,len=items.length;
for(i=0;iitem= items[i].split("=");
args[decodeURIComponent(item[0])]=decodeURIComponent(item[1]);
}
return args;
}
var startTime=new Date();
for(var i=0;iformatUrl2(url);
}
console.log('formatUrl2',( new Date()-startTime)); //formatUrl2 12138
startTime=new Date();
for(var i=0;iformatUrl(url);
}
console.log('formatUrl',(new Date()-startTime)); //formatUrl 12537

The test browser is chrme 25; the regular implemented function is actually better than the array The implemented function should be slower (tears...). But fortunately, it is only 0.4 seconds slower when repeated a million times.