tryjsref_comparison 在线代码实例

 <p>输入你的年龄并点击按钮:</p>
<input id="age" value="18">
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
    var age,voteable;
    age = document.getElementById("age").value;
    voteable = (age < 18) ? "太年轻而不能":"年龄够";
    document.getElementById("demo").innerHTML = voteable + "投票";
}
</script>