资源路径与blobUrl互转

// 生成blobURL
const xhr = new XMLHttpRequest();
xhr.open('GET', 'https://vampireachao.gitee.io/imgs/preview/3356_3.jpg', true);
xhr.responseType = 'blob';
xhr.onload = function (e) {
    if (this.status == 200) {
        var blob = this.response;
        console.log(blob);
        // document.getElementById("myImg").src = URL.createObjectURL(blob);
        console.log(URL.createObjectURL(blob))
    }
};
xhr.send();

// 下载blob
const filename = '3356_3.jpg'
const blobUrlString = 'blob:https://vampireachao.gitee.io/a4adbbc7-8375-424b-b9c3-0d1ec54b7ced'
fetch(blobUrlString)
    .then((response) => response.blob())
    .then((blob) => {
        let aLink = document.createElement('a')
        let evt = document.createEvent('HTMLEvents')
        evt.initEvent('click', true, true)
        aLink.download = filename
        aLink.href = URL.createObjectURL(blob)
        aLink.click()
    })