案例内资源下载:https://www.makeapie.cn/资源地址
// var up = 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.51miz.com%2FElement%2F00%2F75%2F77%2F26%2Fb50e2132_E757726_7b901316.png%21%2Fquality%2F90%2Funsharp%2Ftrue%2Fcompress%2Ftrue%2Fformat%2Fpng%2Ffh%2F630&refer=http%3A%2F%2Fimg.51miz.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641086868&t=abe166401d37d82602953d4ecc316543';
// var down = 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fbpic.588ku.com%2Felement_origin_min_pic%2F19%2F04%2F10%2F36fbb82be564301ca5969797547ba5bc.jpg&refer=http%3A%2F%2Fbpic.588ku.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641086891&t=8b2874cd97398bd514c5458190d9a998'
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运行版本:^4.9.0 Tips:如不显示可切换版本试试
Console调试
 Console调试