javascript

来源：互联网发布：it培训机构排名知乎编辑：程序博客网时间：2024/06/18 01:04

javascript - 焦点事件（onfocus ，onblur ）

<!DOCTYPE html><html>    <head>        <meta charset="utf-8" />        <title></title>        <script>            //获取焦点事件            function myFocus(){            }            //失去焦点事件            function myBlur(){                var cont = document.getElementById("cont");                var str = cont.value;                var f = document.getElementById("f");                if(str == "tom"){                    f.color = "red";                    f.innerHTML = "这个名字太抢手了，再换一个！";                }else{                    f.color = "green";                    f.innerHTML = "√";                }            }            //密码输入效果            //获取焦点            function pwdFocus(){                document.getElementById("img").src = "img/pwd-input.jpg";            }            //失去焦点            function pwdBlur(){                document.getElementById("img").src = "img/user-input.jpg";            }        </script>    </head>    <body>        用户名：<input id="cont" type="text" onfocus="myFocus()" onblur="myBlur()"  /><br />        密码：<input id="pwd" type="password" onfocus="pwdFocus()" onblur="pwdBlur()" />        <font id="f" ></font>        <img id="img" src="img/user-input.jpg" />    </body></html>

运行结果图片

http://img.blog.csdn.net/20170926152940962?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvenlsampm/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center[插入]
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