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脚本之家。
