ajax 只能处理字符串请求，无法处理二进制文件！！！
var form=$("<form>");form.attr("style","display:none");form.attr("target","");form.attr("method","post");form.attr("action","#springUrl(‘/cloudSign/downAll.htm‘)");var input1=$("<input>");input1.attr("type","hidden");input1.attr("name","cloudSignContractVo");input1.attr("value", JSON.stringify(urls));$("body").append(form);form.append(input1);form.submit();
ajax请求下载文件无反应
原文地址：https://www.cnblogs.com/sunyangCoder/p/9370715.html