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示例代码

    
    
    
        *{
            margin: 0;
            padding:0;
        }
        #div{
            width:900px;
            height:400px;
            border:2px solid black;
            margin: 100px auto;
        }
        #span{
            float:left;
            display: block;
            font-size: 100px;
            width: 100px;
            height: 100px;
            line-height: 80px;
            text-align: center;
            border-radius: 50%;
            background: radial-gradient(blue,green);
            animation: move 4s ease 0s infinite alternate;
        }
        @keyframes move {
            0%{
                transform: translate(0px,0px);
            }
            25%{
                transform: translate(200px,300px);
            }
            50%{
                transform: translate(400px,0px);
            }
            75%{
                transform: translate(600px,300px);
            }
            100%{
                transform: translate(800px,0px);
            }
        }

    



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