javascript动态添加下拉选项

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>javascript动态添加下拉选项</title>
</head>
<body>
<select id="dynamicsel">
    <option>1</option>
    <option>2</option>
    <option>3</option>
</select>
<input type="button" value="添加一个选项" id="addoption">
<script>
    var target=document.getElementById("dynamicsel"),
         addoption=document.getElementById("addoption"),i=4;
    addoption.onclick=function(){
        var option=document.createElement("option"),
            optiontext=document.createTextNode(String(i));
            option.appendChild(optiontext);
            target.appendChild(option);
            i++;
    }
</script>
</body>
</html>

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