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昨天有一需求，是希望頁面載入完畢後向左自動滾動一定位置。
一直以為只要給頁面的 document.documentElement.scrollLeft 設定一個數值就生效，結果失望了~
今天抽空一查，才發現：
使用document.documentElement.scrollLeft 設定值，必須在人為事件觸發下才生效；
想要頁面載入完畢時自動滾動一定距離，則使用jquery的animate，如下面例子：
$("html,body").animate({"scrollLeft": "300px"}, 1000);
$("html,body").animate({"scrollTop": "300px"}, 1000);
demo:
複製代碼 代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>自動滾動</title>
<meta name="keywords" content=""/>
<meta name="description" content=""/>
<script type="text/javascript" src="https://www.gamebox.com/js/jquery.js"></script>
</head>
<body>
<!-- container start -->
<div class="container" style="height: 3000px; width: 3000px;">
<a class="btn" href="javascript:;">點擊</a>
</div>
<!-- container end -->
<script type="text/javascript">
/*window.onload = function(){
window.scroll(0,300);
$(".btn").on("click", function(){
document.documentElement.scrollLeft = "500";
var oTop = document.body.scrollTop || document.documentElement.scrollTop;
var oLeft = document.body.scrollLeft || document.documentElement.scrollLeft;
alert(oLeft);
});
}*/
$(function(){
$("html,body").animate({"scrollLeft": "300px"}, 1000);
});
</script>
</body>
</html>
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