js获取table中的数据并拼成json字符串

function tabToJSON(id) {
var trs = document.getElementById(id).getElementsByTagName("tr");//获得tr数组
var titles = trs[0].getElementsByTagName("td");    //获得表头td数组
var json = "";
for(var i = 1; i < trs.length; i++) {
var tds = trs[i].getElementsByTagName("td");
json += "{";
//拼装json
for(var j = 0; j < tds.length; j++)
json += titles[j].innerHTML + ":" + tds[j].innerHTML + ",";
json = json.substring(0, json.length - 1) + "},";
}
json = "[" + json.substring(0, json.length - 1) + "]";
document.getElementById("test").innerHTML = json;
}

function tabToJSONForJquery(id) {
var titles = $("#" + id).find("tr:first td");    //获得表头td数组
//遍历非表头的，tr、td...拼装json
var json = "[" + $("#" + id).find("tr:not(:first)").map(function(i, e) {
return "{" + $(e).children("td").map(function(j, el) {
return $(titles[j]).html() + ":" + $(el).html();
}).get().join(",") + "}";
}).get().join(",") + "]";
$("#test").html(json);
}