s3-amazon 圖像 CORS 問題（僅在 5-8 小時后發生在少數瀏覽器中）

Question

目前，我不知道為什么當我嘗試從 s3 照片中獲取我在5-8 小時前上傳的圖像時一直遇到 CORS 錯誤。 如果我從5-8 小時得到它仍然可以！？ 這是我的 s3 aws 配置：

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>HEAD</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <AllowedMethod>PUT</AllowedMethod>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>`

這是我嘗試獲取圖像的 javascript 代碼：

 function getData(link){ var image = new Image(); // image.crossOrigin = 'use-credentials'; image.crossOrigin = 'anonymous'; // create an empty canvas element var canvas = document.createElement("canvas"), canvasContext = canvas.getContext("2d"); image.onload = function () { //Set canvas size is same as the picture canvas.width = image.width; canvas.height = image.height; // draw image into canvas element canvasContext.drawImage(image, 0, 0, image.width, image.height); // get canvas contents as a data URL (returns png format by default) var dataURL = canvas.toDataURL(); document.getElementById("test").innerHTML = dataURL; }; image.src = link; } getData("https://whammybar.s3.ap-southeast-1.amazonaws.com/duy-gmail-com/productImage/20181001/11bba32c-b276-47f4-b1fa-e87b53136bcc.jpg")

 <span id="test"></span>

Answer 1

問題不在於 S3 存儲桶配置，而在於您如何渲染圖像。

如果您打開您的圖片鏈接，您可以清楚地看到它是可訪問的。

您做錯的是嘗試在span元素中渲染圖像，這就是為什么在您的示例中它將圖像數據顯示為 base64 字符串的原因。

只需將您的span元素更改為img元素，然后將img.src設置為您的dataUrl

 function getData(link){ var image = new Image(); // image.crossOrigin = 'use-credentials'; image.crossOrigin = 'anonymous'; // create an empty canvas element var canvas = document.createElement("canvas"), canvasContext = canvas.getContext("2d"); image.onload = function () { //Set canvas size is same as the picture canvas.width = image.width; canvas.height = image.height; // draw image into canvas element canvasContext.drawImage(image, 0, 0, image.width, image.height); // get canvas contents as a data URL (returns png format by default) var dataURL = canvas.toDataURL(); document.getElementById("test").src = dataURL; }; image.src = link; } getData("https://whammybar.s3.ap-southeast-1.amazonaws.com/duy-gmail-com/productImage/20181001/11bba32c-b276-47f4-b1fa-e87b53136bcc.jpg")

 <img id="test">