项目背景
开发过程中会遇到下载功能,window.open有时候无法满足需求,所以用获取blob实现不跳转下载
具体实现
/**
* 获取 blob 实现不跳转下载
* @param {String} url 目标文件地址
* @return {Promise}
*/
const getBlob = (url) => {
return new Promise(resolve => {
const xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'blob';
xhr.onload = () => {
if (xhr.status === 200) {
resolve(xhr.response);
}
};
xhr.send();
});
}
/**
* 保存
* @param {Blob} blob
* @param {String} filename 想要保存的文件名称
*/
const saveAs = (blob, filename) => {
if (window.navigator.msSaveOrOpenBlob) {
navigator.msSaveBlob(blob, filename);
} else {
let link = document.createElement('a');
let body = document.querySelector('body');
link.href = window.URL.createObjectURL(blob);
link.download = filename;
// fix Firefox
link.style.display = 'none';
body.appendChild(link);
link.click();
body.removeChild(link);
window.URL.revokeObjectURL(link.href);
}
}
/**
* 下载--获取文件 Blob,然后下载重命名
* @param {String} url 目标文件地址
* @param {String} filename 想要保存的文件名称
*/
const downLoadRemoteFile = (url, filename) => {
getBlob(url).then(blob => {
saveAs(blob, filename);
});
}
export default downLoadRemoteFile;