a标签下载的两种方法

1、
下载1

2、

下载2

download(){
    let url = '/files/文件.zip'
    let filename = '下载的文件名称'
    return fetch(url).then(res => res.blob().then(blob => {
        let a = document.createElement('a');
        let url = window.URL.createObjectURL(blob);
        console.log(url);
        a.href = url;
        a.download = filename;
        a.click();
        window.URL.revokeObjectURL(url);
    }))
}