javascript - Ajax 字符串比较

Question

我有一个基本的ajax函数

 setInterval(function() {
      var action = '';
      var status = '';
      $('#php-data').load('../Data/Dashboard.Data.php'); 
      $.ajax({type: 'POST', url: 'Data/Dashboard.Image.php', data: { json: action }, dataType: 'json' }).done(function(data) {
          console.log('Ajax Data: ' + data);
          status = JSON.parse(data);
          **if(status === 'false') {**
              console.log("script is NOT running");
              drawPieChart();
          } else {
              console.log("script is running");
            $('#php-image').load('../Data/Dashboard.Image.php'); //todo only load this is the ajax returned from Dashboard.image.php is true
          }
      });            
  }, 5000);

基本上我的 ajax 返回的唯一东西是“false”，所以当我将 status 与 false 进行比较时，它应该是 true 并且 drawPieChart();但是它总是运行 jquery load() 函数，即使我的 ajax 数据每次都返回 false。我也试过这个:

 setInterval(function() {
      var action = '';
      var status = '';
      $('#php-data').load('../Data/Dashboard.Data.php'); 
      $.ajax({type: 'POST', url: 'Data/Dashboard.Image.php', data: { json: action }, dataType: 'json' }).done(function(data) {
          console.log('Ajax Data: ' + data);
          status = data;
          **if(status === 'false') {**
              console.log("script is NOT running");
              drawPieChart();
          } else {
              console.log("script is running");
            $('#php-image').load('../Data/Dashboard.Image.php'); //todo only load this is the ajax returned from Dashboard.image.php is true
          }
      });            
  }, 5000);

还有这个:

 setInterval(function() {
      var action = '';
      $('#php-data').load('../Data/Dashboard.Data.php'); 
      $.ajax({type: 'POST', url: 'Data/Dashboard.Image.php', data: { json: action }, dataType: 'json' }).done(function(data) {
          console.log('Ajax Data: ' + data);
          **if(data == 'false') {**

              console.log("script is NOT running");
              drawPieChart();
          } else {
              console.log("script is running");
            $('#php-image').load('../Data/Dashboard.Image.php'); //todo only load this is the ajax returned from Dashboard.image.php is true
          }
      });            
  }, 5000);

Answer 1

if(status === 'false')

这暗示了一个字符串。改用这个:

if(status == false)

你可以像这样进一步简化它:

if(!status)