ios微信background-attachment失效解决

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body:before{
    content: ' ';
    position: fixed;
    z-index: -1;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url("../images/bg.png?ewrfg") center no-repeat;
    background-size: 100% 100%;
}