JQuery callbacks.locked() 方法

jQuery 中的callbacks.locked() 方法用于回答回调列表是否已被锁定。

句法：

callbacks.locked()

返回值：此方法返回一个布尔值。

示例 1：在此示例中，回调已被锁定，因此该方法返回 true。

html

  

    
    

  

    
        GeeksForGeeks
    
  
    
        jQuery | callbacks.remove() method
    
  
    
        click here
    
      
    
  
    
        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");
  
            // Locking the callback list
            callbacks.lock();
              
            // Checking using this method
            el_down.innerHTML = callbacks.locked();
        } 
    

  

输出：

示例2：本示例提供了一个按钮来锁定列表，然后调用该方法查看结果。

html

  

    
    

  

  
    
        GeeksForGeeks
    
  
    
        JQuery | callbacks.remove() method
    
  
    
        click here
    
      
    
        lock here
    
      
    
  
    
        var el_down = document.getElementById("GFG");
        var res = "";
        var callbacks = jQuery.Callbacks();
  
        // Defining lock function 
        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>";
            };
              
            // Adding
            callbacks.add(fun);
            callbacks.fire("GFG_1");
            el_down.innerHTML = callbacks.locked();
        } 
    

  

输出：