1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
| class Mvvm {
constructor(options = {}) {
this.$el = options.el;
this.$data = options.data;
this.$vm = this.initProxyVM();
this.$mounted = options.mounted();
this.initObserve();
this.initComplie();
this.mounted();
return this.$vm;
}
initProxyVM() {
return new Proxy(this, {
get: (target, key, receiver) => {
return this[key] || this.$data[key];
},
set: (target, key, value) => {
return Reflect.set(this.$data, key, value);
},
});
}
initObserve() {
this.$data = this.observer(this.$data);
}
initComplie() {
new Complie(this.$el, this.$vm);
}
mounted() {
this.$mounted && this.$mounted.call(this.$vm);
}
observer(object) {
if (!object || typeof object !== "object") return object;
return new Observe(object);
}
}
class Observe {
constructor(object) {
this.dep = new Dep();
Reflect.ownKeys(object).forEach((key) => {
object[key] = this.observer(object[key]);
});
return this.initProxyObject(object);
}
observer(object) {
if (!object || typeof object !== "object") return object;
return new Observe(object);
}
initProxyObject(object) {
const dep = this.dep;
const self = this;
return new Proxy(object, {
get(target, key, receiver) {
if (Dep.target) {
if (!dep.depSet.includes(Dep.exp)) {
dep.addDep(Dep.target);
dep.addDep(Dep.exp);
}
}
return Reflect.get(target, key, receiver);
},
set(target, key, value) {
const res = Reflect.set(target, key, self.observer(value));
dep.notify();
return res;
},
});
}
}
class Complie {
constructor(el, vm) {
this.$el = document.querySelector(el);
this.$vm = vm;
this.fragment = this.createFragment();
this.complieFragment();
this.$el.appendChild(this.fragment);
}
createFragment() {
const fragment = document.createDocumentFragment();
let firstChild = this.$el.firstChild;
while (firstChild) {
fragment.appendChild(firstChild);
firstChild = this.$el.firstChild;
}
return fragment;
}
complieFragment() {
const childNodesArr = [...this.fragment.childNodes];
childNodesArr.forEach((node) => {
if (this.isElementNode(node)) {
const nodeAttrs = [...node.attributes];
nodeAttrs.forEach((attr) => {
const attrName = attr.name;
const attrValue = attr.value;
if (attrName === "v-model") {
node.addEventListener("input", (e) => {
const keyArr = attrValue.split(".");
if (keyArr.length === 1) {
this.$vm[keyArr[0]] = e.target.value;
} else {
let val = this.$vm;
let key = keyArr.pop();
keyArr.forEach((key) => {
val = val[key];
});
val[key] = e.target.value;
}
});
}
});
const text = node.textContent;
const reg = /\{\{(.*?)\}\}/g;
const self = this;
function replaceText() {
node.textContent = text.replace(reg, (matched, placeholder) => {
new Watcher(self.$vm, placeholder, replaceText);
return placeholder.split(".").reduce((a, b) => a[b], self.$vm);
});
}
if (reg.test(text)) {
replaceText();
}
}
});
}
isElementNode(node) {
return node.nodeType === 1;
}
isTextNode(node) {
return node.nodeType === 3;
}
}
class Dep {
static target = null;
static depSet = [];
static exp = null;
constructor() {
this.depSet = [];
}
addDep(dep) {
this.depSet.push(dep);
}
notify() {
this.depSet
.filter((e) => typeof e !== "string")
.forEach((dep) => {
dep.update();
});
}
}
class Watcher {
constructor(vm, exp, fn) {
this.$vm = vm;
this.exp = exp;
this.fn = fn;
Dep.target = this;
Dep.exp = exp;
const arr = exp.split(".");
let val = this.$vm;
arr.forEach((key) => {
val = val[key];
});
Dep.target = null;
}
update() {
let exp = this.exp;
let arr = exp.split(".");
let val = this.$vm;
arr.forEach((key) => {
val = val[key];
});
this.fn(val);
}
}
|