从 ResponseText 中提取值

Question

需要以下代码的帮助。它工作得很好，但我只需要从返回信息中提取并呈现一个值，例如我如何只从以下位置提取“nextRun”值：

function CallWebAPI() {
  var token_ = "*Token*"
  var request_ = new XMLHttpRequest();        
  request_.onreadystatechange=function(){
    		
    if (request_.readyState===4){
      document.getElementById("demo").innerHTML = request_.responseText;
    }
  }
  request_.open("GET", "https://192.168.33.42:4443/v1/Jobs", true);
  request_.setRequestHeader('Access-Control-Allow-Origin','');
  request_.setRequestHeader('Content-Type', 'application/json')
  request_.setRequestHeader('Cache-Control', 'no-cache');	
  request_.setRequestHeader("Authorization", "Bearer "+ token_);
  request_.send();
} 

<h1 id="demo">Must be here</h1>        
<button onclick="document.getElementById('demo').innerHTML=CallWebAPI()">Get Token</button>

Answer 1

存储数据的 url 似乎有问题。看看这个：

    function CallWebAPI() {

    	var token_ = "*Token*"
    	var request_ = new XMLHttpRequest();        
    
      request_.onreadystatechange=function(){
     
       
       console.log(request_.readyState === 4) // readyState is false
    	
      if (request_.readyState===4){
     
          console.log(request_.responseText)
    		    document.getElementById("demo").innerHTML = request_.responseText;
    			}
    		}
    		request_.open("GET", "https://192.168.33.42:4443/v1/Jobs", true);
    		request_.setRequestHeader('Access-Control-Allow-Origin','');
    		request_.setRequestHeader('Content-Type', 'application/json')
    		request_.setRequestHeader('Cache-Control', 'no-cache');	
    		request_.setRequestHeader("Authorization", "Bearer "+ token_);
            request_.send();
    } 

 

document.getElementById("checkAllTopicCheckBoxes").addEventListener ("click", CallWebAPI, false);

<h1 id="demo">Must be here</h1>
 <button id="checkAllTopicCheckBoxes"> Get Token</button>

看起来真正的问题是 request_.readyState 不等于 4。