lovecoding
/
web0715


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <select multiple>
        <option value="黑大">黑大</option>
        <option value="理工">理工</option>
        <option value="农大">农大</option>
        <option value="黑工程">黑工程</option>
    </select>
    <script>
        var oSel = document.getElementsByTagName("select");
        // 表单元素内容发生变化的时候会出发 onchange
        oSel[0].onchange = function(){
            console.log(this.selectedOptions)
            console.log(this.selectedIndex);
            console.log(this.options);
            console.log(this.options[1].selected);
        }

        // oSel[0].ondblclick = function(){
        //     console.log(this);
        // }
    </script>
</body>
</html>