jQuery callbacks.disabled()方法

jQuery callbacks.disabled() 方法是用来检查回调是否被禁用。该方法返回 “true “或 “false”，这取决于回调的情况。

语法:

callbacks.disabled()

返回值：该方法返回一个布尔值。

例子1：这个例子禁用了回调，然后调用callbacks.disabled()方法来查看结果。

<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        jQuery callbacks.disabled() method
    </title>
  
    <script src=
"https://code.jquery.com/jquery-3.5.0.js">
    </script>
</head>
  
<body style="text-align:center;">
    <h1 style="color:green;">
        GeeksForGeeks
    </h1>
      
    <p id="GFG_UP"></p>
      
    <button onclick="Geeks();">
        click here
    </button>
      
    <p id="GFG_DOWN"></p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        el_up.innerHTML = 
            "JQuery | callbacks.disabled() method";
  
        var result = "";
        var callbacks = jQuery.Callbacks();
  
        function Geeks() {
          
            // First function to be added to the list
            var fun1 = function (val) {
                result = result + "This is function 1 and"
                    + " value passed is " + val + "<br>";
            };
  
            callbacks.add(fun1); // Adding the function 1
            callbacks.fire("GFG_1"); // Calling the function 1
            callbacks.disable();
            el_down.innerHTML = callbacks.disabled();
        } 
    </script>
</body>
  
</html>

输出:
jQuery callbacks.disabled()方法

例子2：这个例子提供了一个禁用回调的按钮，然后进行检查。

<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        jQuery callbacks.disabled() method
    </title>
  
    <script src=
"https://code.jquery.com/jquery-3.5.0.js">
    </script>
</head>
  
<body style="text-align:center;">
    <h1 style="color:green;">
        GeeksForGeeks
    </h1>
      
    <p id="GFG_UP"></p>
      
    <button onclick="Geeks();">
        click here
    </button>
      
    <button onclick="disable();">
        disable
    </button>
      
    <p id="GFG_DOWN"></p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        el_up.innerHTML = 
                "JQuery | callbacks.disabled() method";
        var result = "";
        var callbacks = jQuery.Callbacks();
        function disable() {
            callbacks.disable();
        }
        function Geeks() {
  
            // First function to be added to the list
            var fun1 = function (val) {
                result = result + "This is function 1 and"
                    + " value passed is " + val + "<br>";
            };
            callbacks.add(fun1); // Adding the function 1
            callbacks.fire("GFG_1"); // Calling the function 1
            el_down.innerHTML = callbacks.disabled();
        } 
    </script>
</body>
  
</html>

输出:
jQuery callbacks.disabled()方法