第一种提交post的方式是传统方式，判断浏览器进行post请求。

var postData = {
    "name1": "value1",
    "name2": "value2"};
postData = (function(obj){ // 转成post需要的字符串.
    var str = "";
    for(var prop in obj){
        str += prop + "=" + obj[prop] + "&"
    }
    return str;
})(postData);
var xhr = new XMLHttpRequest();
xhr.open("POST", "../module", true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.onreadystatechange = function(){
    var XMLHttpReq = xhr;
    if (XMLHttpReq.readyState == 4&&XMLHttpReq.status == 200) {
            var text = XMLHttpReq.responseText;
            console.log(text);
        }
};
xhr.send(postData);

第二种方式则是虚拟表单的形式提交post请求

function post(URL, PARAMS) {      
    var temp = document.createElement("form");      
    temp.action = URL;      
    temp.method = "post";      
    temp.style.display = "none";      
    for (var x in PARAMS) {      
        var opt = document.createElement("textarea");      
        opt.name = x;      
        opt.value = PARAMS[x];      
        // alert(opt.name)      
        temp.appendChild(opt);      
    }      
    document.body.appendChild(temp);      
    temp.submit();      
    return temp;      
}          
调用方法 如      
post('pages/statisticsJsp/excel.action', {html :prnhtml,cm1:'sdsddsd',cm2:'haha'});