/**
* 下载文件 - 带进度监控
* @param url: 文件请求路径
* @param params: 请求参数
* @param name: 保存的文件名
* @param progress: 进度处理回调函数
* @param success: 下载完成回调函数
* eg: progressDownLoad({url:'http://loacalhost:8080/downLoad.action',name:'file.rar',progress:function(evt){
* console.log(evt);
* }});
**/
function progressDownLoad({url,filename,params,progress,success}){
var xhr = new XMLHttpRequest();
xhr.open("POST", url, true);
//监听进度事件
xhr.addEventListener("progress", function (evt) {
if(progress) try{ progress.call(evt); }catch(e){}
}, false);
xhr.responseType = "blob";
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
xhr.onreadystatechange = function () {
if (xhr.readyState === 4 && xhr.status === 200) {
if (typeof window.chrome !== 'undefined') {
// Chrome version
var link = document.createElement('a');
link.href = window.URL.createObjectURL(xhr.response);
link.download = filename;
link.click();
} else if (typeof window.navigator.msSaveBlob !== 'undefined') {
// IE version
var blob = new Blob([xhr.response], { type: 'application/force-download' });
window.navigator.msSaveBlob(blob, filename);
} else {
// Firefox version
var file = new File([xhr.response], filename, { type: 'application/force-download' });
window.open(URL.createObjectURL(file));
}
if(success) try{ success.call(xhr); }catch(e){}
}
};
// FormData
//var formData = new FormData();
var paramsStr = '';
if(params) for (var key in params) paramsStr += '&'+key+'='+params[key];
if(paramsStr) paramsStr = paramsStr.substring(1);
xhr.send(paramsStr);
}
