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案例代碼如下：
<!DOCTYPE html><html><body><p>點擊這個按鈕，獲得基於時間的問候。</p><button onclick="myFunction()">點擊這裡</button><p id="demo"></p><script>function myFunction(){var x="";var time=new Date().getHours();if (time<20) { x="Good day"; }else { x="Good evening"; }
document.getElementById("demo").innerHTML=x;}</script></body></html>
var elem= document.getElementById("demo"); 擷取元素
elem.innerHTML = x; //elem的html內容就會變成x,這裡的x是html內容
也就是說插入或者替換一段elem的HTML內容，一旦使用了innerHTML 屬性，它的全部內容都將被替換
：
點擊"點擊這裡",出現如下結果：
javascript筆記08：javascript的if...else語句
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