/**
- 设置监听器
/
export function setWatcher(page) {
let data = page.data;
let watch = page.watch;
Object.keys(watch).forEach(v => {
let key = v.split("."); // 将watch中的属性以'.'切分成数组
let nowData = data; // 将data赋值给nowData
for (let i = 0; i < key.length - 1; i++) {
// 遍历key数组的元素,除了最后一个!
nowData = nowData[key[i]]; // 将nowData指向它的key属性对象
}
let lastKey = key[key.length - 1];
// 假设key==='my.name',此时nowData===data['my']===data.my,lastKey==='name'
let watchFun = watch[v].handler || watch[v]; // 兼容带handler和不带handler的两种写法
let deep = watch[v].deep; // 若未设置deep,则为undefine
observe(nowData, lastKey, watchFun, deep, page); // 监听nowData对象的lastKey
});
}
/* - 监听属性 并执行监听函数
*/
function observe(obj, key, watchFun, deep, page) {
var val = obj[key];
// 判断deep是true 且 val不能为空 且 typeof val==='object'(数组内数值变化也需要深度监听)
if (deep && val != null && typeof val === "object") {
Object.keys(val).forEach(childKey => {
// 遍历val对象下的每一个key
observe(val, childKey, watchFun, deep, page); // 递归调用监听函数
});
}
let that = this;
Object.defineProperty(obj, key, {
configurable: true,
enumerable: true,
set: function(value) {
watchFun.call(page, value, val); // value是新值,val是旧值
val = value;
if (deep) {
// 若是深度监听,重新监听该对象,以便监听其属性。
observe(obj, key, watchFun, deep, page);
}
},
get: function() {
return val;
}
});
}
module.exports = {
setWatcher: setWatcher
};
-----watch.js------
/**
* 设置监听器
*/
export function setWatcher(page) {
let data = page.data;
let watch = page.watch;
Object.keys(watch).forEach(v => {
let key = v.split("."); // 将watch中的属性以'.'切分成数组
let nowData = data; // 将data赋值给nowData
for (let i = 0; i < key.length - 1; i++) {
// 遍历key数组的元素,除了最后一个!
nowData = nowData[key[i]]; // 将nowData指向它的key属性对象
}
let lastKey = key[key.length - 1];
// 假设key==='my.name',此时nowData===data['my']===data.my,lastKey==='name'
let watchFun = watch[v].handler || watch[v]; // 兼容带handler和不带handler的两种写法
let deep = watch[v].deep; // 若未设置deep,则为undefine
observe(nowData, lastKey, watchFun, deep, page); // 监听nowData对象的lastKey
});
}
/**
* 监听属性 并执行监听函数
*/
function observe(obj, key, watchFun, deep, page) {
var val = obj[key];
// 判断deep是true 且 val不能为空 且 typeof val==='object'(数组内数值变化也需要深度监听)
if (deep && val != null && typeof val === "object") {
Object.keys(val).forEach(childKey => {
// 遍历val对象下的每一个key
observe(val, childKey, watchFun, deep, page); // 递归调用监听函数
});
}
let that = this;
Object.defineProperty(obj, key, {
configurable: true,
enumerable: true,
set: function(value) {
watchFun.call(page, value, val); // value是新值,val是旧值
val = value;
if (deep) {
// 若是深度监听,重新监听该对象,以便监听其属性。
observe(obj, key, watchFun, deep, page);
}
},
get: function() {
return val;
}
});
}
module.exports = {
setWatcher: setWatcher
};```