jQuery callbacks.fire()用法及代码示例

jQuery callbacks.fire()方法用于调用列表中具有给定参数的所有回调。此方法返回其附加到的回调对象(此)。

用法:

callbacks.fire( arguments )

参数：

arguments:此参数定义要传递回回调列表的参数或参数列表。

返回值：此方法返回其附加到的回调对象(此)。

范例1：本示例将fun1()添加到回调中，然后调用fire()方法，然后再次添加相同的方法以不同的参数调用回调。

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        jQuery callbacks.fire() 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.fire() 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>"; 
            }; 
  
            // Adding the function 1 
            callbacks.add(fun1); 
  
            // Calling with 'GFG_1' 
            callbacks.fire("GFG_1"); 
  
            // Adding the function 1 again 
            callbacks.add(fun1);  
  
            // Calling with argument'GFG_2' 
            callbacks.fire("GFG_2"); 
            el_down.innerHTML = result; 
        }  
    </script> 
</body> 
  
</html>

输出：

范例2：本示例添加了2个不同的函数，并使用不同的参数调用它们。

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JQuery | callbacks.fire() 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.fire() method"; 
        var result = ""; 
        var callbacks = jQuery.Callbacks(); 
        function Geeks() { 
            // function to be added to the list 
            var fun1 = function (val) { 
                result = result + "This is function 1 and" 
                    + " value passed is " + val + "<br>"; 
            }; 
            var fun2 = function (val) { 
                result = result + "This is function 2 and" 
                    + " value passed is " + val + "<br>"; 
            }; 
            callbacks.add(fun1); // Adding the function 1 
            callbacks.fire("GFG_1"); // Calling with 'GFG_1' 
            callbacks.add(fun2); // Adding the function 2 
            callbacks.fire("GFG_2"); // Calling with 'GFG_2' 
            el_down.innerHTML = result; 
        }  
    </script> 
</body> 
  
</html>

输出：

相关用法

注：本文由纯净天空筛选整理自PranchalKatiyar大神的英文原创作品 jQuery callbacks.fire() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。