47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
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/**
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* 设置监听器
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*/
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export function setWatcher(page) {
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let data = page.data;
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let watch = page.watch;
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Object.keys(watch).forEach(v => {
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let key = v.split('.'); // 将watch中的属性以'.'切分成数组
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let nowData = data; // 将data赋值给nowData
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for (let i = 0; i < key.length - 1; i++) { // 遍历key数组的元素，除了最后一个！
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nowData = nowData[key[i]]; // 将nowData指向它的key属性对象
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}
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let lastKey = key[key.length - 1];
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let watchFun = watch[v].handler || watch[v]; // 兼容带handler和不带handler的两种写法
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let deep = watch[v].deep; // 若未设置deep,则为undefine
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observe(nowData, lastKey, watchFun, deep, page); // 监听nowData对象的lastKey
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})
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}
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/**
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* 监听属性 并执行监听函数
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*/
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function observe(obj, key, watchFun, deep, page) {
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var val = obj[key];
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// 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）
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if (deep && val != null && typeof val === 'object') {
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Object.keys(val).forEach(childKey => { // 遍历val对象下的每一个key
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observe(val, childKey, watchFun, deep, page); // 递归调用监听函数
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})
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}
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Object.defineProperty(obj, key, {
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configurable: true,
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enumerable: true,
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set: function (newVal) {
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watchFun.call(page, newVal, val);
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val = newVal;
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if (deep) { // 若是深度监听,重新监听该对象，以便监听其属性。
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observe(obj, key, watchFun, deep, page);
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}
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},
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get: function () {
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return val;
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}
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})
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}
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module.exports = {
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setWatcher: setWatcher
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}
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