JS浏览器特性操作

• //禁用浏览器右键
  

 function forbiddenRightKey()
    { 
        function nocontextmenu()
        { 
            var oEvent=window.event||arguments[0];
            oEvent.cancelBubble = true 
            oEvent.returnValue = false; 
            return false; 
        } 
        function norightclick(e)
        { 
            if (window.Event)
            { 
                if (e.which == 2 || e.which == 3) 
                return false; 
            }
            else if (event.button == 2 || event.button == 3)
            { 
                event.cancelBubble = true 
                event.returnValue = false; 
                return false; 
            }
        }  
        document.oncontextmenu = nocontextmenu; // for IE5+ 
        document.onmousedown = norightclick; // for all others
    }

• 层的悬浮和隐藏
  

    //悬浮某DIV
    function popupDiv(div_id) {   
        var div_obj = $("#"+div_id);  
        var windowWidth = document.body.clientWidth;       
        var windowHeight = document.body.clientHeight;  
        var popupHeight = div_obj.height();       
        var popupWidth = div_obj.width();    
        //添加并显示遮罩层   
        $("<div id='mask'></div>").addClass("mask")   
                                  .width(windowWidth )   
                                  .height(windowHeight)    
                                  .appendTo("body")   
                                  .fadeIn(1);   
        div_obj.css({"position": "absolute"})   
               .css("z-index","9999")
               .animate({left: windowWidth/2-popupWidth/2,    
                         top: windowHeight/2-popupHeight/2, opacity: "show" }, "slow");   
                        
    }   
    //隐藏某DIV  
    function hideDiv(div_id) {   
        $("#mask").remove();   
        $("#" + div_id).animate({left: 0, top: 0, opacity: "hide" }, "slow");   
    }