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JavaScript擷取select下拉框中的第一個值
1、說明
擷取select下拉框中的第一個值
2、實現原始碼
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>JavaScript擷取select下拉框中的第一個值</title><script type="text/javascript"> /** * JavaScript擷取select下拉框中的第一個值 */ function getFirstValOfSelect() { //擷取select中的ID var selectId = document.getElementById("select_option"); //擷取select下拉框中第一個值 var selectValue = selectId.options[0].value; //擷取select下拉框中第一個文本值 var selectText = selectId.options[0].text; //列印select下拉框中第一個值和文本值 alert("值：" + selectValue + "\n" + "文本值：" + selectText); }</script></head><body> <div id="div_select"> <select id="select_option"> <option value="0">桃樹</option> <option value="1">梨樹</option> <option value="2">樟樹</option> <option value="3">楓樹</option> <option value="4">松樹</option> <option value="5">梧桐樹</option> <option value="6">槐樹</option> </select> </div> <input type="button" value="JavaScript擷取select下拉框中的第一個值" onclick="getFirstValOfSelect()"/></body></html>
（1）選中第一項
（2）選中第二項
JavaScript擷取select下拉框中的第一個值
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