png/pdf/...下载

// 图片下载
const url = 'http://......'
fetch(url).then(res => {
	res.blob().then(blob => {
    	var a = document.createElement('a');
        var url = window.URL.createObjectURL(blob);
        var filename = '....png';
        a.href = url;
        a.download = filename;
        a.click();
        window.URL.revokeObjectURL(url);
    })
})

// pdf下载
import FileSaver from 'file-saver';
const url = 'http://......'

const oReq = new XMLHttpRequest();
oReq.open("GET",url,true);
oReq.responseType = "blob";
oReq.onload = () => {
	var file = new Blob([oReq.response]),{
    	type:"application/pdf"
    })
    FileSaver.saveAs(file,'.....pdf')
}
oReq.send()

// 普通下载
const url = 'http://......'
const a = document.createElement('a');
a.target = "_blank";
a.download = "111.doc";
document.body.appendChild(a);
a.click()