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                            1   li
     去除li的小圓點使用的是list-style:none而不是text-decoration
2   jquery設置多個css屬性
    css({"propertyname":"value","propertyname":"value",...});
3  實現元素水平居中
   ~~~
    width: 1200px;
    height:100%;
    margin: 0 auto;
    margin-top:30px;
~~~
4  使用z-index
    z-index需要設置position屬性為absolute,或者relative或者fixed才可生效

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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