文本框内默认值
如何令文本框内出现灰色字体,鼠标点击文本框后自动消失,同时密码那个显示请输入密码
<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>表单标签</title></head><body><form method="post" action="save.php"> <label for="username">用户名:</label> <input type="text" name="username" id="username" value="请填写用户名" /> <br> <label for="pass">密   码:</label> <input type="password" name="pass" id="pass" value="test" /> <br> <input type="submit" value="确定" name="submit" /> <input type="reset" value="重置" name="reset" /></form> </body></html>