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upload_demo_filereader.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>js 图片转base64方式</title>
</head>
<body>
<p id="container1"></p>
<script>
getBase64("./blurry_dog.png")
function getBase64(imgUrl) {
window.URL = window.URL || window.webkitURL;
var xhr = new XMLHttpRequest();
xhr.open("get", imgUrl, true);
xhr.responseType = "blob";
xhr.onload = function () {
if (this.status == 200) {
//得到一个blob对象
var blob = this.response;
console.log("blob", blob)
// 至关重要
var oFileReader = new FileReader();
oFileReader.onloadend = function (e) {
var base64 = e.target.result;
console.log("方式一》》》》》》》》》", base64)
};
oFileReader.readAsDataURL(blob);
//====为了在页面显示图片，可以删除====
var img = document.createElement("img");
img.onload = function (e) {
window.URL.revokeObjectURL(img.src); // 清除释放
};
var src = window.URL.createObjectURL(blob);
img.src = src
document.getElementById("container1").appendChild(img);
//====为了在页面显示图片，可以删除====
}
}
xhr.send();
}
</script>
</body>
</html>