HTML onfocus 事件属性定义和用法onfocus 属性在元素获得焦点时触发。onfocus 常用于 、 以及 .提示：onfocus 属性与 onblur 属性相反。注释：onfocus 属性不适用于以下元素：、、、、、、<meta>、<param>、<script>、<style> 或 <title>。</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;"><strong>实例</strong></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;">当输入字段获得焦点时触发函数。此函数改变输入字段的背景色</p><pre style="margin: 3px auto 0px; padding: 0px 0px 0px 5px; outline: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; width: 640px; line-height: 20px; clear: both; border-left: 3px solid rgb(108, 226, 108);"><script>function setStyle(x){document.getElementById(x).style.background=yellow;}</script></head><body> <p>当输入字段获得焦点时触发函数。此函数改变输入字段的背景色。</p> First name: <input type=text id=fname onfocus=setStyle(this.id)><br>Last name: <input type=text id=lname onfocus=setStyle(this.id)> </body></pre><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;"><strong>HTML onblur 事件属性</strong></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;"><strong>定义和用法</strong></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;">onblur 属性在元素失去焦点时触发。</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;">onblur 常用于表单验证代码（例如用户离开表单字段）。</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;"><strong>实例</strong></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei;">当用户离开输入字段时对其进行验证：</p><pre style="margin: 3px auto 0px; padding: 0px 0px 0px 5px; outline: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; width: 640px; line-height: 20px; clear: both; border-left: 3px solid rgb(108, 226, 108);"><script>function upperCase(){var x=document.getElementById(fname).valuedocument.getElementById(fname).value=x.toUpperCase()}</script></head><body> <p>请输入您的姓名，然后把焦点移动到字段外：</p>请输入您的姓名（英文字符）：<input type=text name=fname id=fname onblur=upperCase()> </body></pre><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, Microsoft YaHei; text-align: center;"></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; 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