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js判斷頁面載入是否完成

<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		body {
			text-align: center;
			font: 700 30px/1.5 arial;
		}
	</style>
</head>

<body>

	<script>
var oBody = document.body;
var i = 0;
document.onreadystatechange = subSomething;

function subSomething() {
	if (document.readyState == "complete") {
		setInterval(function sum() {
			oBody.innerHTML = ++i;
		}, 1000);
	}
}
	</script>
</body>

</html>

.onreadystatechange 檢測頁面狀態

.readtState = "complete";表示頁面載入完成