整理整理

/** 
 * 屏蔽F5 
 */  
function onkeydown(){  
    if (event.keyCode==116){  
        event.keyCode = 0;  
        event.cancelBubble = true;  
        return false;  
    }  
}  
document.onkeydown = this.onkeydown;  
/** 
 * 屏蔽鼠標右鍵  
 */  
function norightclick() {  
    window.event.returnValue=false;   
}  
document.oncontextmenu = this.norightclick;