jQuery callbacks.lock() 方法

jQuery 中的callbacks.lock()方法用于锁定状态中的回调列表。

句法：

callbacks.lock()

返回值：此方法返回它所附加的回调对象。

示例 1：此示例首先添加并触发函数，然后锁定回调列表，然后再次添加并触发函数。

  

    
    

  

    
        GeeksForGeeks
    
  
    
        JQuery | callbacks.lock() method
    
      
    
        click here
    
      
    
  
    
        var el_down = document
                .getElementById("GFG_DOWN");
                  
        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");
  
            // Locking the callback list
            callbacks.lock(); 
  
            // Function again added to list
            callbacks.add(func); 
            callbacks.fire("gfg_2");
            el_down.innerHTML = res;
        } 
    

  

输出：

示例 2：此示例提供了一个按钮来锁定列表，然后添加并触发该函数以检查该方法是否有效。

  

    
    

  

    
        GeeksForGeeks
    
  
    
        JQuery | callbacks.lock() method
    
  
    
        click here
    
      
    
        lock here
    
      
    
  
    
        var el_down = document
                .getElementById("GFG_DOWN");
  
        var res = "";
        var callbacks = jQuery.Callbacks();
        function lock() {
            callbacks.lock();
        }
        function Geeks() {
  
            // Function to be added to the list
            var fun = function (val) {
                res = res + "This is function and "
                + "value passed is " + val + "<br>";
            };
  
            callbacks.add(fun); // Adding
            callbacks.fire("GFG_1");
            el_down.innerHTML = res;
        } 
    

  

输出：