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];        
        temp.appendChild(opt);        
    }        
    document.body.appendChild(temp);        
    temp.submit();        
    return temp;
}
//范例：<a href="javascript:;" onclick="javascript:post('/dosomething', {id:1,name:'Jack'})">test</a>