//url:地址;arg:要变更的参数名;arg_val:要变更的参数值
function changeURLArg(url,arg,arg_val){
  var pattern=arg+'=([^&]*)';
  var replaceText=arg+'='+arg_val;
  if(url.match(pattern)){
    var tmp='/('+ arg+'=)([^&]*)/gi';
    tmp=url.replace(eval(tmp),replaceText);
    return tmp;
  }else{
    if(url.match('[\?]')){
      return url+'&'+replaceText;
     }else{
      return url+'?'+replaceText;
    }
  }
  return url+'\n'+arg+'\n'+arg_val;
}
})

 

//原博客地址:http://blog.csdn.net/dxy_fly/article/details/70256655

 

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