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mvvm 框架的实现
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| <!DOCTYPE html> | |
| <html lang="zh-CN"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>MVVM</title> | |
| <script src="mvvm.js"></script> | |
| </head> | |
| <body> | |
| <div><span>js->dom数据(counter) ：</span><input type="text" q-model="counter"></div> | |
| <div><span>js->dom数据(counter) ：</span><input type="text" q-model="counter"></div> | |
| <div><span>dom->js->dom数据(hello) ：</span><input type="text" q-model="hello"></div> | |
| <div><span>dom->js->dom数据(hello) ：</span><input type="text" q-model="hello"></div> | |
| <div><span>dom->js->dom数据(hello) ：</span><input type="text" q-model="hello"></div> | |
| <h1 q-model="time"></h1> | |
| <h1 q-model="counter"></h1> | |
| <h1 q-model="hello"></h1> | |
| </body> | |
| </html> |
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| (function (document, window) { | |
| 'use strict'; | |
| // 需要被绑定的事件 | |
| var BIND_EVENT = ['keyup', 'change']; | |
| // 用于存储数据 | |
| var database = { | |
| counter: 0, | |
| hello: '', | |
| time: '' | |
| }; | |
| // 绑定事件 | |
| var setEvent = function () { | |
| BIND_EVENT.map(function (eventName) { | |
| // 闭包存储cache | |
| var cache = '' | |
| document.addEventListener(eventName, function (event) { | |
| if (typeof event.target.value != 'undefined' && cache != event.target.value) { | |
| // 修改绑定的数据 | |
| database[event.target.attributes['q-model'].value] = event.target.value; | |
| // 修改缓存 | |
| cache = event.target.value; | |
| } | |
| }) | |
| }); | |
| } | |
| // 设置Property | |
| var setProperty = function (bindModel) { | |
| Object.defineProperty(database, bindModel, { | |
| enumerable: true, | |
| get: function () { | |
| return document.querySelector('[q-model=' + bindModel + ']').value; | |
| }, | |
| set: function (newValue) { | |
| // 赋值到Dom | |
| var allBindingElement = document.querySelectorAll('[q-model=' + bindModel + ']'); | |
| for (var i = 0; i < allBindingElement.length; i++) { | |
| // 修改value | |
| allBindingElement[i].value = newValue; | |
| // 修改innerText | |
| try { | |
| allBindingElement[i].innerText = newValue; | |
| } catch (err) {} | |
| } | |
| } | |
| }); | |
| } | |
| // 遍历，给database的元素添加set，get方法 | |
| var bindData = function () { | |
| // 绑定的数据 | |
| for (var bindModel in database) { | |
| if (database.hasOwnProperty(bindModel)) { | |
| setProperty(bindModel); | |
| } | |
| } | |
| }; | |
| window.onload = function () { | |
| setEvent(); // 给input绑定事件 | |
| bindData(); // 绑定数据 | |
| // 修改js的值会引起dom节点的更新 | |
| var counter = 0; | |
| setInterval(function () { | |
| database.time = (new Date()).toLocaleString(); | |
| database.counter++; | |
| }, 1000); | |
| }; | |
| }(document, window)); |
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