javascript - 调试 Javascript / AJAX 请求

Question

我看到了很多关于如何使用 chrome、firebug 等调试 javascript 的问题和答案......

但这都涉及一个预加载的 js 文件。

有没有办法调试（逐步，而不是警报）作为 Rails AJAX 请求响应的 js 脚本？

Answer 1

Assuming that you have access to edit the file that Rails returns, you can temporarily insert a debugger; statement.

Then, when you have your browser's debugging console open as you receive the AJAX response, JS execution will halt and you can step through execution in the debugger.

Answer 2

如果您更改响应以包含debugger关键字，它应该将其作为断点。您只能从成功处理程序本身检查 ajax 调用的结果。所以在这种情况下，响应将是：

var test = "it isn't working";
var response = $.ajax({
    type: 'GET',
    url: 'jquerydemo.php', 
    success: function(data, textStatus, xhr){
            debugger;
            //alert("it's working");   
        },
    error: function(xhr, textStatus, errorThrown){
            debugger;
            //alert("Error detected");
        }
 });

显然不要忘记在它上线时将其删除。:D