<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
</style>
<script>
window.onload = function(){
var i = 0;
window.onkeydown = function(){
document.title.innerHTML = i++;
}
}
</script>
</head>
<body>
</body>
</html>
获取title标签为什么不是上面这样写？而是直接document.title.= i++;就可以了？
