<span style="font-size:18px;">window.onkeypress = function(e){
			console.log( e.keyCode);
			
		}
	window.onkeydown = function(e){
			console.log( e.keyCode);			
		}
		//上面onkeydown与onkeypress的区别是    onkeydown与onkeyup不会区分字母的大小写，全部会按照大写来识别
		//onkeypress会识别大小写 
			
	window.onkeyup = function(e){
			console.log(e.keyCode);
			
		}</span>