How does jquery or js get the parameter value passed by the url

  function  request(paras)
    
         var  url = location.href; 
         var  paraString = url.substring(url.indexOf( "?" )+1,url.length).split( "&" ); 
         var  paraObj = {} 
         for  (i=0; j=paraString[i]; i++){ 
         paraObj[j.substring(0,j.indexOf( "=" )).toLowerCase()] =
                  j.substring(j.indexOf( "=" )+1,j.length); 
        
         var  returnValue = paraObj[paras.toLowerCase()]; 
         if ( typeof (returnValue)== "undefined" ){ 
         return  ""
         } else
         return  returnValue; 
        
     }
 
调用这个 request就可以了,这里可以调用request( "ID" )

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