| var wrongs = [];
var app = getApp();
exports.getNext = function(index) {
var category = app.getCategory();
for (var i = index; i < 1000; ++i) {
var problem = wx.getStorageSync("wrong_prob_" + category._id + '_' + i);
if (problem) {
problem = JSON.parse(problem);
if (!problem._id) continue;
return { index: i, problem: problem };
} else {
return null;
}
}
}
exports.getPrev = function(index) {
var category = app.getCategory();
for (var i = index; i > 0; --i) {
var problem = wx.getStorageSync("wrong_prob_"+ category._id + '_' + i);
if (problem) {
problem = JSON.parse(problem);
if (!problem._id) continue;
return { index: i, problem: problem };
} else {
return null;
}
}
}
exports.save = function() {
}
exports.add = function(problem) {
var category = app.getCategory();
wx.getStorage({
key: 'wrong_cnt_' + category._id,
success: function(res) {
var cnt = parseInt(res.data) + 1;
wx.setStorage({
key: "wrong_prob_"+ category._id + '_' + cnt,
data: JSON.stringify(problem)
});
wx.setStorage({
key: "wrong_cnt_"+ category._id,
data: cnt.toString()
});
},
fail: function() {
wx.setStorage({
key: "wrong_prob_"+ category._id + '_1',
data: JSON.stringify(problem)
});
wx.setStorage({
key: "wrong_cnt_"+ category._id,
data: '1'
});
}
});
}
exports.del = function(index) {
var category = app.getCategory();
wx.setStorage({
key: "wrong_prob_"+ category._id + '_' + index,
data: '{}'
})
wx.showToast({
title: '移除题目成功',
icon: 'success',
duration: 700
})
}
| 
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