Workaround for Ajax post data when plus variable space

When using Ajax to pass data, the data is usually organized into Data= "Var1=abc&var2=def". When there is a plus (+) or connector (&) in the data, there is some data loss when the server receives the data.

Analyzing the format of the Ajax pass-through data and JavaScript syntax is easy to find:
1. "+" number: javascript resolves to a string connector, so "+" is lost when the server receives the data.
2. "&": javascript resolves to a variable connector, so the data on the server side of the & symbol will be lost when the data is received.

The solution is quite simple, just encode + and & symbols:

Use post to send
Functiondorequestusingpost () 
{ 
    createxmlhttprequest ();
    Varretcode = document.getElementById ("RetCode"). Value;
    Vardata = document.getElementById ("Data"). Value;
    data = Data.replace (/\+/g, "%2b");
    data = Data.replace (/\&/g, "%26");
    varquerystring = "Retcode=" + RetCode + "&data=" + data; 
    varURL = "Backsealservlet";//Use the URL to pass the value 
    xmlhttp.open ("POST", Url,false) to the background;
    Xmlhttp.onreadystatechange = Handlestatechange;
    Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded");
    Xmlhttp.send (queryString);
}