<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<a href="asciicode.html?id=2">跳转到asciicode.html</a>
</body>
</html>
var reful=document.referrer;
alert(reful);
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<a href="asciicode.html?id=2">跳转到asciicode.html</a>
</body>
</html>
var reful=document.referrer;
alert(reful);