//========================= 设置字体大中小 start =============
	function doZoom(size){
		var artibody = document.getElementById('artibody');
		if(!artibody){
			return;
		}
		var artibodyChild = artibody.childNodes;
		artibody.style.fontSize = size + 'px';
		//再对artibody div内的直接html节点设置fontSize属性
		for(var i = 0; i < artibodyChild.length; i++){
			if(artibodyChild[i].nodeType == 1){
				artibodyChild[i].style.fontSize = size + 'px';
			}
		}		
	}
//========================= 设置字体大中小 end =============