本文实例讲述了JavaScript实现文本框中默认显示背景图片在获得焦点后消失的方法。分享给大家供大家参考。具体如下：

html代码：

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1 2 3 4 5 6 7 8 9 form name=searchform id=search-form Search input type=text name=txtInput title=Enter the terms you wish to search for. input type=submit value=GO! class=submit style=cursor: pointer; /form

JS代码：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 script type=text/javascript language=javascript (function() { var id = document.getElementById('search-form'); if (id id.txtInput) { var name = id.txtInput; var unclicked = function() { if (name.value == '') { name.style.background = '#FFFFFF url(images/googbg.png) left no-repeat'; } }; var clicked = function() { name.style.background = '#ffffff'; }; name.onfocus = clicked; name.onblur = unclicked; unclicked(); } })(); /script

希望本文所述对大家的javascript程序设计有所帮助。