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css3 - 为什么运行动画后,原本居中的位置却发生了偏移?

为什么运行动画后,原本居中的位置却发生了偏移?

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
            
            *{
                padding: 0px;
                margin: 0px;
            }
            .box1{
                width: 600px;
                height: 200px;
                background: orange;
                position: relative;
                
            }
            .box1 span{                
                position: absolute;
                border: 8px solid #fff;
                border-top: 8px solid transparent;
                border-radius: 999px;
                top: 50%;left: 50%;
                transform: translate(-50%,-50%);
                
                
            }
            .box1 span:nth-child(1){
                width: 80px;
                height: 80px;                
                /*animation: span1 2s  linear infinite ;*/
                
            }
            .box1 span:nth-child(2){
                width: 40px;
                height: 40px;
                
                /*animation: span2 1s linear infinite ;*/
                
            }
            
            @-webkit-keyframes span1{
                0%{transform: rotate(360deg); opacity: 1;}
                50%{transform: rotate(180deg); opacity: .5;}
                100%{transform: rotate(0deg); opacity: 0;}
            }
            @-webkit-keyframes span2{
                0%{transform: rotate(0deg); opacity: .5;}
                50%{transform: rotate(180deg); opacity: 1;}
                100%{transform: rotate(360deg); opacity: .5;}
            }
            
        </style>
    </head>
    <body>
        <p class="box1">
            <span></span>
            <span></span>
        </p>
</body>

</html>

高洛峰高洛峰2779 hari yang lalu873

membalas semua(6)saya akan balas

  • 伊谢尔伦

    伊谢尔伦2017-04-17 12:02:10

    .box1 span:nth-child(1){
         width: 80px;
         height: 80px;
         animation: span1 2s  linear infinite ;
         margin: -40px 0 0 -40px;
    }
    .box1 span:nth-child(2){
         width: 40px;
        height: 40px;
        animation: span2 1s linear infinite ;
        margin: -20px 0 0 -20px;
    }

    balas
    0
  • 天蓬老师

    天蓬老师2017-04-17 12:02:10

    这个坑我碰到过,你的定位转换别用transfrom,改成margin-left:-50%width;用了transfrom他会把初始位置定位到left:50%的地方。

    balas
    0
  • 大家讲道理

    大家讲道理2017-04-17 12:02:10

    transform-origin: center;

    balas
    0
  • PHP中文网

    PHP中文网2017-04-17 12:02:10

    .box1 span{

    position: absolute;
    border: 8px solid #fff;
    border-top: 8px solid transparent;
    border-radius: 999px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    **transform-origin: 0 0;**
    

    }
    @-webkit-keyframes span1{

    0%{transform: rotate(360deg) **translate(-50%,-50%);** opacity: 1;}
    50%{transform: rotate(180deg) **translate(-50%,-50%);** opacity: .5;}
    100%{transform: rotate(0deg) **translate(-50%,-50%);** opacity: 0;}

    }
    @-webkit-keyframes span2{

    0%{transform: rotate(0deg) **translate(-50%,-50%);** opacity: .5;}
    50%{transform: rotate(180deg) **translate(-50%,-50%);** opacity: 1;}
    100%{transform: rotate(360deg) **translate(-50%,-50%);** opacity: .5;}

    }

    balas
    0
  • 伊谢尔伦

    伊谢尔伦2017-04-17 12:02:10

    原因是楼上说的,因为用了css3动画,所上面设置偏移的时候不要用transfrom,顺手把具体的代码写出来:

    <!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
            * {
                padding: 0px;
                margin: 0px;
            }
    
            .box1 {
                width: 600px;
                height: 200px;
                background: orange;
                position: relative;
            }
    
            .box1 span {
                position: absolute;
                border: 8px solid #fff;
                border-top: 8px solid transparent;
                border-radius: 999px;
                top: 50%;
                left: 50%;
                /*移除这里定位*/
            }
    
            .box1 span:nth-child(1) {
                width: 80px;
                height: 80px;
                /*新增*/
                margin-left: -40px;
                margin-top: -40px;
                animation: span1 2s  linear infinite ;
            }
    
            .box1 span:nth-child(2) {
                width: 40px;
                height: 40px;
                /*新增*/
                margin-left: -20px;
                margin-top: -20px;
                animation: span2 1s linear infinite ;
            }
            @keyframes span1 {
                0% {
                    transform: rotate(360deg);
                    opacity: 1;
                }
                50% {
                    transform: rotate(180deg);
                    opacity: .5;
                }
                100% {
                    transform: rotate(0deg);
                    opacity: 0;
                }
            }
            @-webkit-keyframes span1 {
                0% {
                    transform: rotate(360deg);
                    opacity: 1;
                }
                50% {
                    transform: rotate(180deg);
                    opacity: .5;
                }
                100% {
                    transform: rotate(0deg);
                    opacity: 0;
                }
            }
    
            @-webkit-keyframes span2 {
                0% {
                    transform: rotate(0deg);
                    opacity: .5;
                }
                50% {
                    transform: rotate(180deg);
                    opacity: 1;
                }
                100% {
                    transform: rotate(360deg);
                    opacity: .5;
                }
            }
        </style>
    </head>
    
    <body>
        <p class="box1">
            <span></span>
            <span></span>
        </p>
    </body>
    
    </html>
    

    balas
    0
  • PHP中文网

    PHP中文网2017-04-17 12:02:10

    你需要用绝对定位将要旋转的元素的初始点定位到元素的中心,正常的初始点是在左上
    用left:50%;top:50%;margin-left:-20px/元素的二分之一/;margin-top:-20px/元素的二分之一/;
    这样元素的旋转就不会出现交错了。

    balas
    0
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