JQ——事件（鼠标、按键）

1、鼠标事件

(1)鼠标单击：click

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>鼠标单击事件</title>
        <script type="text/javascript" src="../js/jquery-1.8.3.js" ></script>
        <script>
            $(function(){
                $("#button").click(function(){
                alert("按键被单击了！");
                });
            });
        </script>
    </head>
    <body>
        <button id="button">请点击！</button>
    </body>
</html>

（2）鼠标双击事件：dblclick

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>鼠标单击事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
            $(function(){
                $("button").dblclick(function(){
                alert("鼠标双击了！！");
                });
            });
        </script>
    </head>
    <body>
       <button>请双击，以触发事件！</button>
    </body>
</html>

（3）mouseenter鼠标移动到相应元素上的时候触发，mouseleave鼠标不在相应的元素上的时候触发：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>鼠标单击事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
            $(function(){
                $("p").mouseenter(function(){
                alert("鼠标移动到了段落上！");
                });
                
                $("p").mouseleave(function(){
                alert("鼠标从段落上移开了！");
                });
            });
        </script>
    </head>
    <body>
       <p>Just go. Just go. I just keep going until it feels right to me.</p>
    </body>
</html>

(4)hover()：鼠标悬停在元素上的时候触发

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>鼠标悬停事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
          $(function(){
            $("p").hover(function(){
            $("p").css("background-color","red");
            },function(){
            $("p").css("background-color","yellow");
          });
        });
        </script>
    </head>
    <body>
     <p>Just go. Just go. I just keep going until it feels right to me.</p>
    </body>
</html>

2、键盘事件

(1)keypress()：按键被按下

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>鼠标悬停事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
          $(function(){
               $("input").keypress(function(){
            alert("有按键按下了！");
          });
        });
        </script>
    </head>
    <body>
       <input type="text">
    </body>
</html>

（2）keyup()：按键抬起触发

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>按键事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
          $(function(){
               $("input").keyup(function(){
            alert("按键抬起了！");
          });
        });
        </script>
    </head>
    <body>
       <input type="text">
    </body>
</html>

按下按键没有警告框，只有按键抬起的时候对话框才会出现。

（3）keydown()：按键按下有效

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>按键事件</title>
        <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
        </script>
        <script>
          $(function(){
               $("input").keydown(function(){
            alert("按键按下了！");
          });
        });
        </script>
    </head>
    <body>
       <input type="text">
    </body>
</html>

与keypress不同，keydown是一个过程，只有在按键按下的过程中才会有对话框出现，按键抬起对话框立即消失。

JQ——事件（鼠标、按键）

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