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添加代理函数_proxyAttribbute。代理vm.$options.methods 到vm上 #49

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添加代理函数_proxyAttribbute。代理vm.$options.methods 到vm上 #49

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65 changes: 45 additions & 20 deletions js/mvvm.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,10 +5,16 @@ function MVVM(options) {

// 数据代理
// 实现 vm.xxx -> vm._data.xxx
Object.keys(data).forEach(function(key) {
Object.keys(data).forEach(function (key) {
me._proxyData(key);
});

// 代理methods
// 实现 vm.xxx -> vm.options.methods.xxx
Object.keys(me.$options.methods).forEach(function (key) {
me._proxyAttribute(key, me.$options.methods, me)
});

this._initComputed();

observe(data, this);
Expand All @@ -18,35 +24,54 @@ function MVVM(options) {

MVVM.prototype = {
constructor: MVVM,
$watch: function(key, cb, options) {
$watch: function (key, cb, options) {
new Watcher(this, key, cb);
},

_proxyData: function(key, setter, getter) {
_proxyData: function (key, setter, getter) {
var me = this;
setter = setter ||
Object.defineProperty(me, key, {
configurable: false,
enumerable: true,
get: function proxyGetter() {
return me._data[key];
},
set: function proxySetter(newVal) {
me._data[key] = newVal;
}
});
setter = setter ||
Object.defineProperty(me, key, {
configurable: false,
enumerable: true,
get: function proxyGetter() {
return me._data[key];
},
set: function proxySetter(newVal) {
me._data[key] = newVal;
}
});
},

_initComputed: function() {
/**
*
* @param {*} key source的一个要被代理的属性名
* @param {*} source source的各个属性被代理到target
* @param {*} target target[key] 可以访问到source[key]
*/
_proxyAttribute: function (key, source, target) {
Object.defineProperty(target, key, {
configurable: false,
enumerable: false,
get: function proxyGetter() {
return source[key];
},
set: function proxySetter(newVal) {
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@DMQ DMQ Sep 16, 2020

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不需要set

source[key] = newVal;
}
});
},

_initComputed: function () {
var me = this;
var computed = this.$options.computed;
if (typeof computed === 'object') {
Object.keys(computed).forEach(function(key) {
Object.keys(computed).forEach(function (key) {
Object.defineProperty(me, key, {
get: typeof computed[key] === 'function'
? computed[key]
: computed[key].get,
set: function() {}
get: typeof computed[key] === 'function' ?
computed[key] :
computed[key].get,
set: function () {}
});
});
}
Expand Down