今天面试nodejs被双向数据绑定考蒙了，感觉智商收到了严重的侮辱，特写一个极单的双向绑定安慰下自己 ```js class Bind { constructor(type, element) { this.type = type; this.element = element; } get prop() { if (this.type === 'html') { return this.element.innerHTML; } else if (this.type === 'value') { return this.element.value } } set prop(value) { if (this.type === 'html') { this.element.innerHTML = value; } else if (this.type === 'value') { this.element.value = value; } } } class Data { constructor(data) { this.data = data; this.map = new Map(); const doms = document.querySelectorAll("body *"); for (const dom of doms) { let prop; let bind; if (dom.dataset.html) { prop = dom.dataset.html; bind = new Bind('html', dom); } else if (dom.dataset.value) { prop = dom.dataset.value; bind = new Bind('value', dom); } if (prop) { this.map.set(`${prop}`, bind); } } } change(prop, value) { const bind = this.map.get(prop); bind.prop = value; this.map.set(prop, bind); } } const bind = (data) => { const databind = new Data(data); const proxy=new Proxy(data,{ set(target,key,value){ databind.change(key, value); } }) return proxy; } ``` 测试页： ```html

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