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JS顯示下拉式清單方塊內全部元素的方法，js下拉式清單方塊元素
本文執行個體講述了JS顯示下拉式清單方塊內全部元素的方法。分享給大家供大家參考。具體如下：
下面的JS代碼可以通過alert框顯示指定下拉式清單的全部元素
<!DOCTYPE html><html><head><script>function getOptions(){var x=document.getElementById("mySelect");var txt="All options: ";var i;for (i=0;i<x.length;i++) { txt=txt + "\n" + x.options[i].text; }alert(txt);}</script></head><body><form>Select your favorite fruit:<select id="mySelect"> <option>Apple</option> <option>Orange</option> <option>Pineapple</option> <option>Banana</option></select><br><br><input type="button" onclick="getOptions()"value="Output all options"></form></body></html>
希望本文所述對大家的javascript程式設計有所協助。
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