1 <!DOCTYPE html> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>表单事件</title> 6 <script type="text/javascript"> 7 //表单焦点失去、获得 8 onload = function () { 9 var txt = document.getElementById("txt"); 10 txt.onblur = function () { 11 if (txt.value == "") { 12 txt.value = "如123abc@163.com"; 13 } 14 } 15 txt.onfocus = function () { 16 if (txt.value == "如123abc@163.com") { 17 txt.value = ""; 18 } 19 } 20 } 21 </script> 22 </head> 23 <body> 24 <form id="fm"> 25 <!--有时提交会出现405错误，可能与name，value，id有关--> 26 <input type="text" name="uid" value="" id="txt" /><br /> 27 <input type="password" name="pwd" value="" /><br /> 28 <input type="submit" value="提交" id="btn1" /><br /> 29 </form> 30 31 </body> 32 </html>