<!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>
</head>
<body>
<p>hello world</p>
<input type="text">
<script>
document.addEventListener("mousedown" , function( evt ){
var e = evt || event;
// 判定事件源是否是input，如果不是input那么我们就阻止默认事件;
var target = e.target || e.srcElement;
if( target.nodeName !== "INPUT"){
e.preventDefault();
}
})
//禁用鼠标右键
document.addEventListener("contextmenu" , function( evt ){
var e = evt || event;
e.preventDefault();
});
document.addEventListener("keydown" , function( evt ){
var e = evt || event;
var code = e.keyCode || e.which;
//禁止F12
if( code === 123){
e.preventDefault();
}
})
</script>
</body>
</html>
运用事件源监听