<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
<script>
// keyup 鼠标弹起事件
document.onkeyup = function() {
console.log(1111);
}
// keydown鼠标按下事件
document.onkeydown = function() {
console.log(3333);//一直按着就会一直触发这个事件
}
document.onkeypress = function() {//不能识别功能键，
console.log(444);
}
// keypress鼠标按下事件
</script>
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