取得input中部分选中(selected)的值

select|选中

　　取得input中部分选中(selected)的值（for IE and Firefox），这个例子非常不错，给大家共享一下。

<script language="javascript">var agt=navigator.userAgent.toLowerCase();var ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1) && (agt.indexOf("omniweb") == -1));function a(){var myArea = document.getElementById("s");var selection;if (!ie){if (myArea.selectionStart!= undefined) {selection = myArea.value.substr(myArea.selectionStart, myArea.selectionEnd - myArea.selectionStart);}}else{if (window.getSelection){selection = window.getSelection();}else if (document.getSelection){selection = document.getSelection();}else if (document.selection){selection = document.selection.createRange().text;}}alert(selection)}</script><input type="text" value="testtest" id="s" name="s" />
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