鼓浪屿小吃一条街:Ajax调用aspx后台函数用dataset 写入innerHTML乱码？

有谁知道怎么解决？

doCoreProductBind: function() {
// alert(document.getElementById(this.u_ele).value);
Pages.digidea.NewProduct(this.doCoreProductBind_callback.bind(this));

},
doCoreProductBind_callback: function(res) {

var ds = res.value;
//alert(res.value);
var c = document.getElementById("CoreProducts");
if(ds != null && typeof(ds) == "object" && ds.Tables != null && res.error == null){
var str = "<div class=coreproductdetail id=CoreProductLeft><ul>";

for(var i=0; i<ds.Tables[0].Rows.length; i++){
str += "<li><a href=productDetail.aspx?productId=";
str += ds.Tables[0].Rows[i]["productId"] +" target=_blank>";
str += ds.Tables[0].Rows[i]["productName"].toString() +"</a>";
//alert(ds.Tables[0].Rows.length\2);
if(i==(ds.Tables[0].Rows.length%2)){
str += "<li class=li01><a href=ProductMore.aspx target=_blank class=more>更多>>  </a></li>";
str += "</ul></div><div class=coreproductdetail id=CoreProductRight><ul>";
}else if(i==ds.Tables[0].Rows.length-1){
str += "<li class=li01><a href=ProductMore.aspx target=_blank class=more>更多>>  </a></li>";
str += "</ul></div></div>";
}

}

alert(str);
c.innerHTML = str.toString();
c.style.visibility = "visible";

}
}