JS: GET parameters on the HTML page

Refer:Http://blog.sina.com.cn/s/blog_5f0d2f4b0100ttrd.html

The main principle is to use a regular expression to match strings in location. Search.

Three main methods:

Method	Description
Getquerystring	Obtain the array of querystring. For example, define querystringdemo.html? Id = 5 & type = 1 & flag = 0 ["Id = 5", "Type = 1", "flag = 0"]
Getquerystringbyname	Obtain the value based on the querystring parameter name.
Getquerystringbyindex	Retrieve Value Based on querystring parameter index

 

 

// Obtain the querystring Array

Function getquerystring (){

    VaR result = location. Search. Match (New Regexp ("[\? \ &] [^ \? \ &] + = [^ \? \ &] + "," G "));

    If (result = NULL ){

        Return "";

    }

    For (VAR I = 0; I <result. length; I ++ ){

        Result [I] = Result [I]. substring (1 );

    }

    Return result;

}

// Obtain the value based on the querystring parameter name

Function getquerystringbyname (name ){

    VaR result = location. Search. Match (New Regexp ("[\? \ &] "+ Name +" = ([^ \ &] +) "," I "));

    If (result = NULL | result. Length <1 ){

        Return "";

    }

    Return result [1];

}

// Obtain the value based on the querystring parameter index

Function getquerystringbyindex (INDEX ){

    If (Index = NULL ){

        Return "";

    }

    VaR querystringlist = getquerystring ();

    If (index> = querystringlist. Length ){

        Return "";

    }

    VaR result = querystringlist [Index];

    VaR startindex = result. indexof ("=") + 1;

    Result = result. substring (startindex );

    Return result;

}

 

Another method:

String. Prototype. getquerystring = function (name ){
VaR Reg = new Regexp ("(^ | & | \\?) "+ Name +" = ([^ &] *) (& | $) "), R;
If (r = This. Match (REG) return R [2];
Return NULL;
};

Use: location. Search. getquerystring ("parameter name ");