原型 - 事件 isLeftClick() 方法

此方法确定与按钮相关的鼠标事件是否与“左键”（实际上是“主”键）相关。

语法

Event.isLeftClick(event);

返回值

如果按下左键，则返回 true。

示例

注意 - 看起来此方法在 MSIE 中不起作用。

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         // Register event 'click' and associated call back.
         Event.observe(document, 'click', respondToClick);
  
         // Callback function to handle the event.
         function respondToClick(event) {
            var bool = Event.isLeftClick(event);
            
            if ( bool ) {
               alert("Left button is pressed...." );
            }
         }
      </script>
   </head>

   <body>
      <p id = "note"> Click anywhere to see the result.</p>
      <p>This example may not work in IE.</p>
      <p id = "para1">This is paragraph 1</p>
      <p id = "para2">This is paragraph 2</p>
      <div id = "division">This is divsion.</div>
   </body>
</html>

输出

prototype_event_handling.htm

打印页面