class myvue {
constructor(options){
this.$options = options;
// 数据响应化
this.$data = options.data;
this.observe(this.$data);
}
observe(value) {
if(!value || typeof value !== ‘object‘){
return;
}
// 遍历该对象
Object.keys(value).forEach(key => {
this.defineReactive(value, key, value[key])
})
}
defineReactive(obj, key, val) {
this.observe(val); // 递归解决数据嵌套
Object.defineProperty(obj, key, {
get(){
return val;
},
set(newVal) {
if(newVal === val) {
return;
}
val = newVal;
console.log(`${key}属性更新了：${val}`);
}
})
}
}
