freeCodeCamp/guide/chinese/javascript/tutorials/the-javascript-version-of-jquerygetjson/index.md

title, localeTitle

title	localeTitle
JavaScript Version of Jquerygetjson	Jquerygetjson的JavaScript版本

如果你想使用只有vanilla JavaScript的json文件。

IE8 +

var request = new XMLHttpRequest(); 
 request.open('GET', '/my/url', true); 
 
 request.onreadystatechange = function() { 
  if (this.readyState === 4) { 
    if (this.status >= 200 && this.status < 400) { 
      // Success! 
      var data = JSON.parse(this.responseText); 
    } else { 
      // Error :( 
    } 
  } 
 }; 
 
 request.send(); 
 request = null; 

IE9 +

var request = new XMLHttpRequest(); 
 request.open('GET', '/my/url', true); 
 
 request.onload = function() { 
  if (request.status >= 200 && request.status < 400) { 
    // Success! 
    var data = JSON.parse(request.responseText); 
  } else { 
    // We reached our target server, but it returned an error 
 
  } 
 }; 
 
 request.onerror = function() { 
  // There was a connection error of some sort 
 }; 
 
 request.send(); 

IE10 +

var request = new XMLHttpRequest(); 
 request.open('GET', '/my/url', true); 
 
 request.onload = function() { 
  if (this.status >= 200 && this.status < 400) { 
    // Success! 
    var data = JSON.parse(this.response); 
  } else { 
    // We reached our target server, but it returned an error 
 
  } 
 }; 
 
 request.onerror = function() { 
  // There was a connection error of some sort 
 }; 
 
 request.send();