js 获取回车事件 兼容ie 火狐 谷歌

		document.onkeydown=function(event)
		{
			e = event ? event :(window.event ? window.event : null);
			var currKey=0;
			currKey=e.keyCode||e.which||e.charCode;
			if(currKey==13){
				login1();
			}
		};