HTML中json数据的处理

<!DOCTYPE html>
<html>
<head>
    <title>Ajax查询用户信息_json数据处理</title>
    <meta charset="utf-8" />
    <style type="text/css">
      .head{
         position:relative;
         border:2px solid #2e79c7;
        width:500px;
         margin:50px auto 0px auto;
      }
      .title{
         background-color:#2e79c7;
        width:100%;
         line-height:30px;
         font-size:15px;
         color:#ffffff;
      }
      .search{
        width:100%;
         text-align:center;
         line-height:50px;
      }
      .preh{
         height:290px;
      }
      .lines{
        display:flex;
         justify-content:flex-start;
      }
      .lines div{
        height:30px;
         line-height:30px;
      }
      .lines div:nth-of-type(1){
         width:100px;
         text-align:left;
      }
    </style>
    <script type="text/javascript">
      //定义ajax浏览器对象
      var request;
      var result = {};
      //ajax通过姓名，查询详细信息
      function getCityInfo(){
          //补全ajax代码
          request = new XMLHttpRequest();

     request.onreadystatechange = function(){
              if(request.readyState == 4 && request.status==200){
                  result = JSON.parse(request.responseText);
var s = 0;
result.forEach(item=>{
    s=s+item;
})
document.getElementById("result").innerHTML=s;
              }
};
        var number = document.getElementById("number").value;
      request.open("post","res/htmlclassics/php/test_city.php",false);
       request.setRequestHeader("content-type","application/x-www-form-urlencoded");
      request.send("&number="+number);
      }
    </script>
</head>
<body>

    <div class="head">
      <div class="title">代号查询</div>
      <div class="search">
        请选择：
        <select id="number">
          <option value="汽车">汽车</option>
          <option value="食品">食品</option>
          <option value="数码">数码</option>
          <option value="服饰">服饰</option>
        </select>
        <input type="button" value="查询" οnclick="getCityInfo()" />
      </div>
    </div>

    <div class="head preh">
      <div class="title">计算结果</div>
      <div class="lines">
        <div>结果：</div>
        <div id="result"></div>
        </div>
    </div>
</body>
</html>

HTML中json数据的处理

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