js获取select默认选中的Option并不是当前选中值_javascript技巧

<script> <BR>function getDefaultSelectedOption(selectId, valIfNull) { <BR>var dom, selectId = selectId.replace(/^#/, ''), opts; <BR>try { <BR>opts = document.getElementById(selectId).getElementsByTagName('option'); <BR>for (var i in opts) { <BR>if (opts[i].defaultSelected) { <BR>dom = opts[i]; <BR>break; <BR>} <BR>} <BR>} catch (e) { <BR>} <BR>return dom||valIfNull; <BR>} <BR></script>

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test
<script> <BR>function getDefaultSelectedOption(selectId, valIfNull) { <BR>var dom, selectId = selectId.replace(/^#/, ''), opts; <BR>try { <BR>opts = document.getElementById(selectId).getElementsByTagName('option'); <BR>for (var i in opts) { <BR>if (opts[i].defaultSelected) { <BR>dom = opts[i]; <BR>break; <BR>} <BR>} <BR>} catch (e) { <BR>} <BR>return dom||valIfNull; <BR>} <BR></script>
<script> <BR>document.getElementById('btn').onclick = function () { <BR>alert((getDefaultSelectedOption('sel1', {})).value); <BR>}; <BR></script>