支持IE浏览器下载文件--转成zip,excel,pdf

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1. 应把请求头设置：responseType: 'blob' const data = await defHttp.get({url: url, params:params,responseType: 'blob'}, {isTransformResponse: false})   服务器响应之后：    if (typeof window.navigator.msSaveBlob !== 'undefined') {       window.navigator.msSaveBlob(new Blob([data], {type: 'application/vnd.ms-excel'}), name + '.xls')     } else {       let url = window.URL.createObjectURL(new Blob([data], {type: 'application/vnd.ms-excel'}))       let link = document.createElement('a')       link.style.display = 'none'       link.href = url       link.setAttribute('download', name + '.xls')       document.body.appendChild(link)       link.click()       document.body.removeChild(link); //下载完成移除元素       window.URL.revokeObjectURL(url); //释放掉blob对象     }