0){
html += '';
}
});
if(totalDue===0){
html = '🎉 今日无待复习题，可刷新题。
';
} else if(totalDue>0){
html = '' + html;
} else {
html = '还没有 v2 学习数据。打开任一 K 页做一道题后自动生成。
';
}
grid.innerHTML = html;
}
// 5. 渲染错题本（按错因分组）
function renderWrong(){
var v2all = enumerateV2();
var reasonCount = {}; // {概念混淆: n, ...}
var totalWrong = 0;
Object.keys(v2all).forEach(function(K){
var map = v2all[K];
Object.keys(map).forEach(function(stid){
var rec = map[stid];
if(rec && rec.failCount>0){
totalWrong++;
(rec.wrongReasons||[]).forEach(function(r){
reasonCount[r] = (reasonCount[r]||0)+1;
});
}
});
});
var box = document.getElementById('seWrongReasons');
if(!box) return;
if(totalWrong===0){
box.innerHTML = '还没有错题记录。
';
return;
}
var html = '共 '+totalWrong+' 道错题被标记：
';
['概念混淆','计算错误','记忆模糊','审题错'].forEach(function(r){
var n = reasonCount[r]||0;
html += ''+r+''+n+'';
});
html += '
';
box.innerHTML = html;
}
// 6. 渲染学习热力图（最近14天）
function renderHeat(){
var box = document.getElementById('seHeatBars');
if(!box) return;
var days = [];
var max = 1;
for(var i=13;i>=0;i--){
var d = new Date(); d.setDate(d.getDate()-i);
var key = 'study_duration_'+d.getFullYear()+'-'+String(d.getMonth()+1).padStart(2,'0')+'-'+String(d.getDate()).padStart(2,'0');
var sec = parseInt(rd(key)||'0',10)||0;
days.push({label:(d.getMonth()+1)+'/'+d.getDate(), sec:sec, today:i===0});
if(sec>max) max=sec;
}
var html = '';
days.forEach(function(d){
var h = Math.max(2, Math.round(d.sec/max*70));
var mins = Math.floor(d.sec/60);
var secs = d.sec%60;
html += ''+d.label+'：'+mins+'分'+secs+'秒
';
});
box.innerHTML = html;
}
// 7. 渲染
renderReview();
renderWrong();
renderHeat();
// 每30秒刷新一次
setInterval(function(){ renderReview(); renderWrong(); renderHeat(); }, 30000);
})();