js实现文字列表无缝向上滚动

        body{font-size:12px}
        #demo{overflow:hidden; height:80px; width:280px; margin:90px auto; position:relative;}
        #demo1{height:auto; text-align:left;}
        #demo2{height:auto; text-align:left;}
        #demo1 li, #demo2 li{list-style-type:none; height:22px; text-align:left; }




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