标签：prototype port ret 绑定 view OLE foreach lang back
绑定确实是个有趣的话题。
现在我的绑定器有了不少的功能
1. 附着在Object对象上，一切以对象为中心
2. 与页面元素进行双向绑定
3. 与任意对象绑定，主要是应用在绑定到页面元素的一些属性上，比如style，当然也可以绑定到任意用户自定义的对象上
4. 可以绑定到方法，让对象具有AddEventListener类似的功能，这应该是终极的扩展功能了
5. 支持selector，function，object 的参数写法
6. 默认绑定到value或者innerHTML属性上
Object.prototype.bind = function (key, obj, prop, event) { var that = this if (this[key] == undefined) this[key] = ‘‘; var bc = undefined; if (!this.__bc__) { this.__bc__ = {}; Object.defineProperty(this, "__bc__", { enumerable: false }); } if (!this.__bc__[key]) { this.__bc__[key] = []; this.__bc__[key].value = this[key] bc = this.__bc__[key]; Object.defineProperty(this, key, { get: function () { return bc.value }, set: function (value) { if (bc.value == value) return; bc.forEach(function (l) { l(value); }) bc.value = value } }) } bc = this.__bc__[key]; if (prop == undefined) prop = "value"; if (event == undefined) event = ‘change‘; if (typeof obj == ‘string‘) { var els = document.querySelectorAll(obj); function b(el, p) { if (el[p] == undefined) p = "innerHTML" bc.push(function (value) { el[p] = value; }); if (el.addEventListener) { el.addEventListener(event, function (e) { that[key] = el[p]; }) } el[p] = bc.value; } for (var i = 0; i < els.length; i++) { var el = els[i]; b(el, prop) } } else if (typeof obj == ‘function‘) { bc.push(obj); obj(bc.value); } else if (typeof obj == ‘object‘) { var p = prop if (obj[p] == undefined) p = "innerHTML" bc.push(function (value) { obj[p] = value; }) obj[p] = bc.value; if (obj.addEventListener) { obj.addEventListener(event, function (e) { that[key] = obj[p]; }) } } else { console.log("obj = " + obj + " 不是 [selector,function,element] 中的任何一种，绑定失败！") } }
再来个简单的例子
<!DOCTYPE html> <html lang="en"> <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>测试项目</title> <script src="bind.js"></script> </head> <body> <h1 class="v1"></h1> <input class="v1" type="text" id="i1"> <input type="text" id="i2"> <script> var a = { value: ‘s‘, s: ‘red‘ } a.bind(‘value‘, ".v1", ‘value‘, ‘input‘) a.bind(‘s‘, i1.style, ‘background‘) a.bind(‘s‘, i2) </script> </body> </html>
标签：prototype port ret 绑定 view OLE foreach lang back
原文地址：https://www.cnblogs.com/allofalan/p/11832131.html
