JQuery Ajax passes special character parameters (e.g. +)

When using jquery ajax to pass parameter para=1+1 to the background, the background receives a parameter of Para=1 1, and the solution is to use JSON to pass the code as follows.

varurl = "/test/check"; $.ajax ({type:"POST", Url:url,//data: "Para=1+1", data is a string when the background received the parameter is 1 1Data: {"Para":}, //Data is JSON when the background receives the parameter is  the cache:false, Async:false, DataType:"JSON", Success:function(data, Textstatus, JQXHR) {if("true" = =Data.flag) {Alert (Legitimate "); return true; }Else{alert ("Not legal!" The error message is as follows: "+data.errormsg); return false; }}, Error:function(XMLHttpRequest, Textstatus, Errorthrown) {alert ("The request failed!" "); }     });

JQuery Ajax passes special character parameters (e.g. +)