//键盘事件对象中的altkey ctrlKey shiftKey对应三个键alt ctrl shift
document.onkeydown = function(e){
var evt = e || event;
console.log(evt.altKey, evt.ctrlKey, evt.shiftKey);
//判断是否按了某一个键
//我们这里以回车键举例.keyCode
if(evt.keyCode === 13){
console.log('你按的是回车键');
}else{
console.log('你按得不是回车键');
}
}
<!DOCTYPE HTML>
<html lang = 'en'>
<head>
<meta charset = 'UTF-8'/>
<title>Document1</title>
<style>
div{
width:500px;
height:500px;
border:1px solid black;
}
</style>
</head>
<body>
<div></div>
<input type = 'text'/>
<input type = 'button' value = '发布'/>
<script>
var div = document.getElementsByTagName('div')[0];
var text = document.getElementsByTagName('input')[0];
var button = document.getElementsByTagName('input')[1];
button.onclick = function(){
div.innerHTML = text.value;
}
document.onkeydown = function(e){
var evt = e || event;
console.log(evt.ctrlKey);
console.log(evt.keyCode);
if(evt.keyCode === 13&&evt.ctrlKey){
div.innerHTML = text.value;
}
}
</script>
</body>
</html>