根據原圖,計算一個寬或高最大100的圖片的計算方法
const previewImageRatio = previewImageWidth / previewImageHeight; // 原圖寬高比例
let thumbnailHeight,thumbnailWidth;// 縮略圖高和寬
if(previewImageRatio > 1){
thumbnailWidth = 100; // 縮略圖寬度固定為 100
thumbnailHeight = thumbnailWidth / previewImageRatio;
}else{
thumbnailHeight = 100;
thumbnailWidth = thumbnailHeight * previewImageRatio;
}

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