使用 localStorage做缓存优化

//获取一级分类数据，并保存到本地
function get1Category() {
    appcan.window.openToast("玩命加载数据中...", 20000, 5, 1);
    var data_cahe = getLocVal(‘get1Category‘);
    if(!data_cahe){
        appcan.ajax({
        url : apiUrl + ‘standard1Category.action‘,
        type : "GET",
        datatype : "json",
        timeout : 30000,
         ajaxCache: true,
        success : function(data, status, requestCode, response, xhr) {
            data2 = JSON.stringify(data);
            setLocVal(‘get1Category‘,data2);
            get1Category();//递归调用
        },
        error : function(xhr, erroType, error, msg) {
            appcan.window.openToast("获取一级分类数据失败", 1000, 5, 0);
        }
    });
    }else{
          //alert(data_cahe);
            data = JSON.parse(data_cahe);
            data = JSON.parse(data);
            if (data.code == ‘1‘) {
                var cate = data.data;
                var str = ‘‘;
                str += ‘<table class="ula tx-c" border="0" cellspacing="0" style="color:#fff;padding-right:1.75em;font-size:1.125em">‘
                str += ‘<tr id="cate2" style="width:100%">‘
                str += ‘<td><div class="btn2 title1 active1"  id="index">推荐</div></td>  ‘;
                for (var i = 0; i < cate.length; i++) {
                    str += ‘<td><div class="btn1 title‘ + (i + 2) + ‘" onclick="goSc2(\‘‘ + cate[i].id + ‘\‘ ,\‘‘ + cate[i].name + ‘\‘,1)" >‘ + cate[i].name + ‘</div></td>‘;
                }
                str += ‘</tr>‘
                str += ‘</table>‘    
                $(‘#scroller‘).html(str);
                nav_weight();
                scrollX();
    }
}
}