本文實例講述了JavaScript實現文本框中默認顯示背景圖片在獲得焦點後消失的方法。分享給大家供大家參考。具體如下：
html代碼：
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1 2 3 4 5 6 7 8 9 <form name="searchform" id="search-form"> <div> <b>Search</b> <input type="text" name="txtInput" title="Enter the terms you wish to search for." /> <input type="submit" value="GO!" class="submit" style="cursor: pointer;" /> </div> </form>JS代碼：
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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>希望本文所述對大家的javascript程序設計有所幫助。