表现

设置了scroll-top的scroll-view组件，在组件所在vue实例data发生改变时会自动回弹到最上方

解决方案

打开 node_modules/mpvue/index.js, 在任意位置添加以下两个方法

function calcDiff(holder, key, newObj, oldObj) { if (newObj === oldObj || newObj === undefined) { return } if (newObj == null || oldObj == null || typeof newObj !== typeof oldObj) { holder[key] = newObj } else if (Array.isArray(newObj) && Array.isArray(oldObj)) { if (newObj.length === oldObj.length) { for (var i = 0, len = newObj.length; i < len; ++i) { calcDiff(holder, key + '[' + i + ']', newObj[i], oldObj[i]) } } else { holder[key] = newObj } } else if (typeof newObj === 'object' && typeof oldObj === 'object') { var newKeys = Object.keys(newObj) var oldKeys = Object.keys(oldObj) if (newKeys.length !== oldKeys.length) { holder[key] = newObj } else { var allKeysSet = Object.create(null) for (var i = 0, len = newKeys.length; i < len; ++i) { allKeysSet[newKeys[i]] = true allKeysSet[oldKeys[i]] = true } if (Object.keys(allKeysSet).length !== newKeys.length) { holder[key] = newObj } else { for (var i = 0, len = newKeys.length; i < len; ++i) { var k = newKeys[i] calcDiff(holder, key + '.' + k, newObj[k], oldObj[k]) } } } } else if (newObj !== oldObj) { holder[key] = newObj }}function diff(newObj, oldObj) { var keys = Object.keys(newObj) var diffResult = {} for (var i = 0, len = keys.length; i < len; ++i) { var k = keys[i] var oldKeyPath = k.split('.') var oldValue = oldObj[oldKeyPath[0]] for (var j = 1, jlen = oldKeyPath.length; j < jlen && oldValue !== undefined; ++j) { oldValue = oldValue[oldKeyPath[j]] } calcDiff(diffResult, k, newObj[k], oldValue) } return diffResult}

2.找到 throttleSetData 修改为

var throttleSetData = throttle(function (page, data) { page.setData(diff(data, page.data));}, 50);

3.找到 updateDataToMP 方法, 将 throttleSetData 的调用方式改为

throttleSetData(page, data);

希望官方早日修复，参考：

使用脏检查优化每次更新数据时都会传输大量数据的问题, 解决删除回退, 列表忽然滚动到顶部等问题

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。