显示隐藏菜单

var i = 1;
	//隐藏左侧菜单事件
	$('.angle').click(function(){
		if(i%2==1){
			$(this).removeClass('fa-angle-double-left').addClass('fa-angle-double-right');
			$('#nav-l').hide();
			$('#work-c').width($(document).width()-4);
			$('#iframe_Imain').attr('src', $('#iframe_Imain').attr('src'));
			i++;
		}else{
			$(this).removeClass('fa-angle-double-right').addClass('fa-angle-double-left');
			$('#nav-l').show();
			initWorkLayerout();
			$('#iframe_Imain').attr('src', $('#iframe_Imain').attr('src'));
			i++;
		}
	});