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
189
190
191
192
193
194
195
196
197
198
199
200
| <body>
<div id="app">
<input type="text" v-model="msg">
<div>{{msg}}</div>
</div>
<script name="Watcher">
class Watcher {
constructor (vm, expr, callback) {
this.vm = vm
this.expr = expr
this.callback = callback
Dep.target = this
this.oldVal = this.getVmData()
Dep.target = null
}
getVmData () {
let val = this.vm.$data[this.expr]
return val
}
update () {
let newVal = this.getVmData()
if (this.oldVal !== newVal) {
this.callback(newVal, this.oldVal)
this.oldVal = newVal
}
}
}
class Dep {
constructor () {
this.subs = []
}
addSubs (watcher) {
this.subs.push(watcher)
}
notify () {
this.subs.forEach(sub => {
sub.update()
})
}
}
</script>
<script name="Observer">
class Observer {
constructor (data) {
this.data = data
this.walk(data)
}
walk (data) {
if (!data || typeof data !== "object") return
Object.keys(data).forEach(key => {
this.defineReactive(data, key, data[key])
this.walk(data[key])
})
}
defineReactive (obj, key, val) {
let dep = new Dep()
Object.defineProperty(obj, key, {
enumerable:true,
configurable: true,
get: function () {
Dep.target && dep.addSubs(Dep.target)
return val
},
set: (newVal) => {
if (val === newVal) return
val = newVal
this.walk(newVal)
dep.notify()
}
})
}
}
</script>
<script name="Compile">
class Compile {
constructor (el, vm) {
this.el = typeof el === 'string' ? document.querySelector(el) : el
this.vm = vm
if (el) {
let fragment = this.node2fragment(this.el)
this.compileFragment(fragment)
this.el.appendChild(fragment)
}
}
node2fragment (el) {
let fragment = document.createDocumentFragment()
let childNodes = el.childNodes
this.toArray(childNodes).forEach(child => {
fragment.appendChild(child)
})
return fragment
}
compileFragment (fragment) {
let childNodes = fragment.childNodes
this.toArray(childNodes).forEach(node => {
if (this.isElementNode(node)) {
this.compileElementNode(node)
}
if (this.isTextNode(node)) {
this.compileTextNode(node)
}
if (node.childNodes && node.childNodes.length) {
this.compileFragment(node)
}
})
}
isElementNode (node) {
return node.nodeType === 1
}
isTextNode (node) {
return node.nodeType === 3
}
compileElementNode (node) {
let that = this
let attrs = node.attributes
this.toArray(attrs).forEach(attr => {
if (attr.nodeName === 'v-model') {
let expr = attr.nodeValue
node.value = this.vm.$data[expr]
node.addEventListener('input', function () {
that.vm.$data[expr] = this.value
})
new Watcher(this.vm, expr, newVal => {
node.value = newVal
})
}
})
}
compileTextNode (node) {
let reg = /\{\{(.*)\}\}/
if (reg.test(node.nodeValue)) {
let expr = RegExp.$1
node.textContent = this.vm.$data[expr]
new Watcher(this.vm, expr, newVal => {
node.textContent = newVal
})
}
}
toArray(classArray) {
return [].slice.call(classArray)
}
}
</script>
<script name="Vue">
class Vue {
constructor (options = {}) {
this.$data = options.data
this.$methods = options.methods
this.$el = options.el
this.proxyData(this.$data)
this.proxyData(this.$methods)
new Observer(this.$data)
if (this.$el) {
new Compile(this.$el, this)
}
}
proxyData (data) {
if (!data) return
Object.keys(data).forEach(key => {
Object.defineProperty(this, key, {
enumerable: true,
configurable: true,
get () {
return data[key]
},
set (v) {
if (data[key] === v) return
data[key] = v
}
})
})
}
}
</script>
<script>
let vm = new Vue({
el: '#app',
data: {
msg: 'hi'
}
})
setTimeout(() => {
vm.msg = 'hhh'
}, 1000);
</script>
</body>
|
