Created
June 9, 2018 07:47
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双向数据绑定
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Title</title> | |
| </head> | |
| <body> | |
| <input id="dataInput" type="text" > | |
| <p id="inputShow">{{inputValue}}</p> | |
| <button onclick="mvvm.set()">重回初始值</button> | |
| <script src="./mvvm.js"></script> | |
| <script> | |
| mvvm = new Render({ | |
| inputEle:'#dataInput', | |
| showEle:'#inputShow', | |
| data:{ | |
| inputValue:'demo' | |
| } | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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| class Render { | |
| /** | |
| * | |
| * @param {Object} opts 渲染函数的配置对象 | |
| * @param {String} opts.showEle 视图元素的选择器 | |
| * @param {String} opts.inputEle 输入触发的选择器 | |
| * @param {Object} opts.data 绑定元素的数据 | |
| * | |
| */ | |
| constructor(opts) { | |
| this.opts = opts; | |
| this.defuault = JSON.parse(JSON.stringify(opts.data)); | |
| this.showEle = document.querySelector(opts.showEle); | |
| this.inputEle = document.querySelector(opts.inputEle); | |
| this.key = null; | |
| this.data = opts.data; | |
| this.pattern = /^{{(\w+)}}/ | |
| this.init(); | |
| } | |
| init() { | |
| //绑定事件变化 | |
| this.inputEle.oninput = this.onchange.bind(this); | |
| this.show(); | |
| this.set(); | |
| } | |
| onchange(events) { | |
| let val = events.target.value; | |
| this.set(val); | |
| } | |
| show() { | |
| let txt = this.showEle.textContent; | |
| let self = this; | |
| //todo 此处过于简陋 | |
| if(!this.key) { | |
| this.showEle.textContent = txt.replace(this.pattern, (match, key) => { | |
| self.key = key; | |
| return self.data[key]; | |
| }).toString(); | |
| } else { | |
| this.showEle.textContent = self.data[this.key]; | |
| } | |
| } | |
| set(value = this.defuault[this.key]) { | |
| this.data[this.key] = value; | |
| this.inputEle.value = this.data[this.key]; | |
| this.show(); | |
| } | |
| } |
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