Specific steps for AJAX get request to submit data

Use GET to request data to submit, mainly throughSplice the query parameters after the URLThe specific steps are as follows:

1. Construct the URL with parameters

Add the data toKey = ValueAfter the form of   is spliced ​​into the URL, use it between multiple parameters.&connect. For example:

var url = "/api?param1=value1&param2=value2";  

If the parameter value contains special characters (such as spaces, Chinese, etc.), it is requiredencodeURIComponent()Encoding to ensure that the URL is legal:

var paramValue = "Special Value/Space";  
var encodedParam = encodeURIComponent(paramValue);  
var url = `/api?param=${encodedParam}`;  

2. Initiate a GET request

useXMLHttpRequestThe object initiates a request and passes the constructed URL inopen()method:

var xhr = new XMLHttpRequest();  
("GET", url, true); // The third parameter is whether it is asynchronous, generally set to true(); // GET Requested send() Usually no parameters（The data is already here URL middle）  

Example：

 = function() {  
  ("helloBtn").onclick = function() {  
    var xhr = new XMLHttpRequest();  
    // Splicing parameters (assuming that user information is obtained, the parameters are user name and age)    var params = "username=John&age=30";  
    var url = "/ajax/ajaxrequest1?" + params;  
    ("GET", url, true);  
     = function() {  
      if ( === 4 &&  === 200) {  
        // Process response data        ();  
      }  
    };  
    ();  
  };  
};  

Notice：

• The parameters requested by the GET are exposed to the URL.Not suitable for transferring sensitive data(such as password).
• Different browsers have restrictions on URL length (usually about 4KB) and are not suitable for transferring large amounts of data.

In this way, data can be submitted to the server in the GET request of AJAX.

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