案例内资源下载:https://www.makeapie.cn/资源地址
var PatternSrc = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACcAAACyAgMAAAC8Zj5WAAAADFBMVEU1mcQAAAA1mcQ1mcQFya0nAAAABHRSTlMZAAkRJfDlNAAAAFtJREFUOMtjCIWBEAYyAcIEkpikgDMGh3nAyIAkK1bBwAqSbPsPA39Ism03DOwgyTaEI0myDeFIWtk2NJIGfW07bwwFNvRIiIgUNZoQB33SQIBBXEaNJsQhmRABdkqh2Grn4rYAAAAASUVORK5CYII='
var PatternImg = new Image();
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运行版本:^3.8.0 Tips:如不显示可切换版本试试
Console调试
 Console调试