jQuery callbacks.remove()方法

jQuery callbacks.remove()方法是用来从回调列表中删除一个单一的回调或回调的集合。

语法:

callbacks.remove( callbacks )

参数:

callbacks。这个参数指定了一个函数，或者一个函数数组，要从回调列表中删除。

返回值：该方法返回它所连接的Callbacks对象。

例子1：在这个例子中，有一个删除方法，用来从列表中删除函数’func’。

<!DOCTYPE HTML>
<html>
  
<head>
    <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>
        jQuery | callbacks.remove() method
    </p>
  
    <button onclick="Geeks();">
        click here
    </button>
  
    <p id="GFG"></p>
  
    <script>
        var el_down = document.getElementById("GFG");
        var res = "";
        var callbacks = jQuery.Callbacks();
  
        function Geeks() {
            var func = function (val) {
                res = res + "value passed is - " + val;
            };
  
            // Function added to list
            callbacks.add(func);
            callbacks.fire("gfg_1");
  
            // Removing the func from list
            callbacks.remove(func);
              
            // Now This will not work
            callbacks.fire("gfg_2");
            el_down.innerHTML = res;
        } 
    </script>
</body>
  
</html>

输出:

jQuery callbacks.remove()方法

例子2：这个例子提供了一个按钮，从Callbacks列表中移除函数’fun’。

<!DOCTYPE HTML>
<html>
  
<head>
    <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>
        JQuery | callbacks.remove() method
    </p>
  
    <button onclick="Geeks();">
        click here
    </button>
      
    <button onclick="remove();">
        remove
    </button>
      
    <p id="GFG"></p>
  
    <script>
        var el_down = document.getElementById("GFG");
        var res = "";
        var callbacks = jQuery.Callbacks();
  
        var fun = function (val) {
            res = res + "This is function and "
                + "value passed is " + val + "<br>";
        };
  
        // Adding function to Callback list
        callbacks.add(fun);
          
        // Defining function to remove
        function remove() {
            callbacks.remove(fun);
        }
          
        function Geeks() {
            callbacks.fire("GFG_1");
            el_down.innerHTML = res;
        } 
    </script>
</body>
  
</html>

输出：函数被从回调列表中删除。

jQuery callbacks.remove()方法