zoukankan html css js c++ java

选择select里面某个option触发的事件

<html>
<head>
<script type="text/javascript">
    window.onload = function() {
        var sel = document.getElementById("mySelect");
        if(sel&&sel.addEventListener){
            sel.addEventListener('change',function(e){
                var ev = e||window.event;
                var target = ev.target||ev.srcElement;
                alert(target.value);
            },false)
        }
    }
</script>
</head>
<body>

<form>
Select your favorite fruit:
<select id="mySelect">
  <option value="20">Apple</option>
  <option value="30">Orange</option>
  <option value="40">Pineapple</option>
  <option value="50">Banana</option>
</select>
<br /><br />
<input type="button" value="Alert index of selected option">
</form>

</body>
</html>

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原文地址：https://www.cnblogs.com/chenmiaosong/p/7755017.html