微信小程序canvas組件

canvas組件會遮住全部原生組件，設置z-index屬性也無效 但cover-view和cover-img能夠用來覆蓋原生組件。cover-view和cover-img嵌套有限制， cover-view只能嵌套cover-view和cover-imgweb <canvas> <cover-view> <cover-view></cover-view> <cover-img><

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