最终效果

分析

看到这个效果我们首先应该想到和拖动有关的api: onmousedown, onmousemove, onmouseup

其次要支持用户传入放置这个组件的dom元素和完成的回调事件。

最终如何使用？

我们先来看下使用方式，再来决定我们怎么编写这个库

编写库的整体初始框架

(function () {// =================代码块1=========================================var root = (typeof self == 'object' && self.self == self && self) ||(typeof global == 'object' && global.global == global && global) ||this || {}; var util = {extend: function (target) {for (var i = 1, len = arguments.length; i < len; i++) {for (var prop in arguments[i]) {if (arguments[i].hasOwnProperty(prop)) {target[prop] = arguments[i][prop]}}}return target},isValidListener: function (listener) {if (typeof listener === 'function') {return true} else if (listener && typeof listener === 'object') {return util.isValidListener(listener.listener)} else {return false}},addCSS: function (cssText) {var style = document.createElement('style'),  //创建一个style元素head = document.head || document.getElementsByTagName('head')[0]; //获取head元素style.type = 'text/css'; //这里必须显示设置style元素的type属性为text/css，否则在ie中不起作用if (style.styleSheet) { //IEvar func = function () {try { //防止IE中stylesheet数量超过限制而发生错误style.styleSheet.cssText = cssText;} catch (e) {}}//如果当前styleSheet还不能用，则放到异步中则行if (style.styleSheet.disabled) {setTimeout(func, 10);} else {func();}} else { //w3c//w3c浏览器中只要创建文本节点插入到style元素中就行了var textNode = document.createTextNode(cssText);style.appendChild(textNode);}head.appendChild(style); //把创建的style元素插入到head中},indexOf: function (array, item) {if (array.indexOf) {return array.indexOf(item);} else {var result = -1;for (var i = 0, len = array.length; i < len; i++) {if (array[i] === item) {result = i;break;}}return result;}}}function EventEmitter() {this._events = {}}EventEmitter.prototype.on = function (eventName, listener) {if (!eventName || !listener) return;if (!util.isValidListener(listener)) {throw new TypeError('listener must be a function');}var events = this._events;var listeners = events[eventName] = events[eventName] || [];var listenerIsWrapped = typeof listener === 'object';// 不重复添加事件if (util.indexOf(listeners, listener) === -1) {listeners.push(listenerIsWrapped ? listener : {listener: listener,once: false});}return this;};EventEmitter.prototype.once = function (eventName, listener) {return this.on(eventName, {listener: listener,once: true})};EventEmitter.prototype.off = function (eventName, listener) {var listeners = this._events[eventName];if (!listeners) return;var index;for (var i = 0, len = listeners.length; i < len; i++) {if (listeners[i] && listeners[i].listener === listener) {index = i;break;}}if (typeof index !== 'undefined') {listeners.splice(index, 1, null)}return this;};EventEmitter.prototype.emit = function (eventName, args) {var listeners = this._events[eventName];if (!listeners) return;for (var i = 0; i < listeners.length; i++) {var listener = listeners[i];if (listener) {listener.listener.apply(this, args || []);if (listener.once) {this.off(eventName, listener.listener)}}}return this;};// =================代码块2=========================================function SliderTools(options) {this.options = util.extend({}, this.constructor.defaultOptions, options)this.init();this.bindEvents();this.diffX = 0;this.flag = false;//是否拖动到最右侧}SliderTools.defaultOptions = {el: document.body //默认放到body里};var proto = SliderTools.prototype = new EventEmitter();//SliderTools继承emitterproto.constructor = SliderTools;//修正构造器proto.init = function () {this.createSlider();//创建插件所需要的dom元素this.getElements();//获取创建好的元素}// =================代码块3=========================================if (typeof exports != 'undefined' && !exports.nodeType) {if (typeof module != 'undefined' && !module.nodeType && module.exports) {exports = module.exports = SliderTools;}exports.SliderTools = SliderTools;} else {root.SliderTools = SliderTools;}
}());

代码块1是在判断是在浏览器环境还是nodeJS环境，方便代码三后期使用， 代码块2声明了一个对象$SliderTools$,将用户传进来的$option$和默认的$defaultOption$进行合并

编写核心函数1(创建dom和css)

proto.createSlider = function () {this.options.el.innerHTML = '<div id="slider"><div class="drag_bg"></div><div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div><div class="handler handler_bg"></div></div>';//像指定元素中放置插件的dom元素util.addCSS('ul,li {list-style: none;} a {text-decoration: none;} .wrap {width: 300px;height: 350px;text-align: center;margin: 150px auto;}.inner {padding: 15px;} .clearfix {overflow: hidden;_zoom: 1;} .none {display: none;} #slider {position:relative;background-color: #e8e8e8;width: 300px;height: 34px;line-height: 34px;text-align: center;} #slider .handler {position: absolute;top: 0px;left: 0px;width: 40px;height: 32px;border: 1px solid #ccc;cursor: move;}    .handler_bg {background: #fff  url("data:image/png;base64,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") no-repeat center;} .handler_ok_bg {background: #fff    url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA3hpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDIxIDc5LjE1NTc3MiwgMjAxNC8wMS8xMy0xOTo0NDowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDo0ZDhlNWY5My05NmI0LTRlNWQtOGFjYi03ZTY4OGYyMTU2ZTYiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6NDlBRDI3NjVGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6NDlBRDI3NjRGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTQgKE1hY2ludG9zaCkiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDphNWEzMWNhMC1hYmViLTQxNWEtYTEwZS04Y2U5NzRlN2Q4YTEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6NGQ4ZTVmOTMtOTZiNC00ZTVkLThhY2ItN2U2ODhmMjE1NmU2Ii8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+k+sHwwAAASZJREFUeNpi/P//PwMyKD8uZw+kUoDYEYgloMIvgHg/EM/ptHx0EFk9I8wAoEZ+IDUPiIMY8IN1QJwENOgj3ACo5gNAbMBAHLgAxA4gQ5igAnNJ0MwAVTsX7IKyY7L2UNuJAf+AmAmJ78AEDTBiwGYg5gbifCSxFCZoaBMCy4A4GOjnH0D6DpK4IxNSVIHAfSDOAeLraJrjgJp/AwPbHMhejiQnwYRmUzNQ4VQgDQqXK0ia/0I17wJiPmQNTNBEAgMlQIWiQA2vgWw7QppBekGxsAjIiEUSBNnsBDWEAY9mEFgMMgBk00E0iZtA7AHEctDQ58MRuA6wlLgGFMoMpIG1QFeGwAIxGZo8GUhIysmwQGSAZgwHaEZhICIzOaBkJkqyM0CAAQDGx279Jf50AAAAAABJRU5ErkJggg==")    no-repeat center;}#slider .drag_bg {background-color: #7ac23c;    height: 34px;width: 0px;} #slider .drag_text {position: absolute;    top: 0px;width: 300px;-moz-user-select: none;-webkit-user-select: none;user-select: none;-o-user-select: none;-ms-user-select: none;    }.unselect {-moz-user-select: none;-webkit-user-select: none;    -ms-user-select: none;}.slide_ok {color: #fff;}')//像页面里add新的样式
}
proto.getElements = function () {this.slider = document.querySelector('#slider');this.drag_bg = document.querySelector('.drag_bg');this.handler = document.querySelector('.handler');
}

编写核心函数2(绑定事件)

proto.bindEvents = function () {var self = this;self.handler.onmousedown = function (e) {self.diffX = e.clientX - self.handler.offsetLeft;util.setClassName(self.slider, 'unselect'); //禁止选择样式document.onmousemove = function (e) {let deltaX = e.clientX - self.diffX;if (deltaX >= self.slider.offsetWidth - self.handler.offsetWidth) { //拖动到了最右侧deltaX = self.slider.offsetWidth - self.handler.offsetWidth;self.flag = true;} else if (deltaX <= 0) {deltaX = 0;self.flag = false;} else {self.flag = false;}util.setInlineStyle([self.handler], 'left', deltaX + 'px');util.setInlineStyle([self.drag_bg], 'width', deltaX + 'px');}document.onmouseup = function (e) {util.setClassName(self.slider, '')if (self.flag) {util.setClassName(self.slider, 'slide_ok') //拖动完成后的样式util.addClass(self.handler, 'handler_ok_bg')拖动完成后的样式self.handler.onmousedown = null //防止拖动完成后再次拖动self.emit('complete')//emit通知使用者的回调事件} else {util.setInlineStyle([self.handler], 'left', 0 + 'px');util.setInlineStyle([self.drag_bg], 'width', 0 + 'px');}document.onmousemove = null;document.onmouseup = null;}}
}

添加工具方法(核心函数2中用到的)

var util = {// ...初始框架里的那部分setClassName(selector, className) {selector.className = className;},addClass(selector, className) {selector.classList.add(className);},setInlineStyle(selector, attr, content) {let length = selector.length;for (let i = 0; i < length; i++) {selector[i].style[attr] = content;}},
}

最终完整可运行代码

(function () {var root = (typeof self == 'object' && self.self == self && self) ||(typeof global == 'object' && global.global == global && global) ||this || {};var util = {extend: function (target) {for (var i = 1, len = arguments.length; i < len; i++) {for (var prop in arguments[i]) {if (arguments[i].hasOwnProperty(prop)) {target[prop] = arguments[i][prop]}}}return target},setClassName(selector, className) {selector.className = className;},addClass(selector, className) {selector.classList.add(className);},setInlineStyle(selector, attr, content) {let length = selector.length;for (let i = 0; i < length; i++) {selector[i].style[attr] = content;}},isValidListener: function (listener) {if (typeof listener === 'function') {return true} else if (listener && typeof listener === 'object') {return util.isValidListener(listener.listener)} else {return false}},addCSS: function (cssText) {var style = document.createElement('style'),  //创建一个style元素head = document.head || document.getElementsByTagName('head')[0]; //获取head元素style.type = 'text/css'; //这里必须显示设置style元素的type属性为text/css，否则在ie中不起作用if (style.styleSheet) { //IEvar func = function () {try { //防止IE中stylesheet数量超过限制而发生错误style.styleSheet.cssText = cssText;} catch (e) {}}//如果当前styleSheet还不能用，则放到异步中则行if (style.styleSheet.disabled) {setTimeout(func, 10);} else {func();}} else { //w3c//w3c浏览器中只要创建文本节点插入到style元素中就行了var textNode = document.createTextNode(cssText);style.appendChild(textNode);}head.appendChild(style); //把创建的style元素插入到head中},indexOf: function (array, item) {if (array.indexOf) {return array.indexOf(item);} else {var result = -1;for (var i = 0, len = array.length; i < len; i++) {if (array[i] === item) {result = i;break;}}return result;}}}function EventEmitter() {this._events = {}}EventEmitter.prototype.on = function (eventName, listener) {if (!eventName || !listener) return;if (!util.isValidListener(listener)) {throw new TypeError('listener must be a function');}var events = this._events;var listeners = events[eventName] = events[eventName] || [];var listenerIsWrapped = typeof listener === 'object';// 不重复添加事件if (util.indexOf(listeners, listener) === -1) {listeners.push(listenerIsWrapped ? listener : {listener: listener,once: false});}return this;};EventEmitter.prototype.once = function (eventName, listener) {return this.on(eventName, {listener: listener,once: true})};EventEmitter.prototype.off = function (eventName, listener) {var listeners = this._events[eventName];if (!listeners) return;var index;for (var i = 0, len = listeners.length; i < len; i++) {if (listeners[i] && listeners[i].listener === listener) {index = i;break;}}if (typeof index !== 'undefined') {listeners.splice(index, 1, null)}return this;};EventEmitter.prototype.emit = function (eventName, args) {var listeners = this._events[eventName];if (!listeners) return;for (var i = 0; i < listeners.length; i++) {var listener = listeners[i];if (listener) {listener.listener.apply(this, args || []);if (listener.once) {this.off(eventName, listener.listener)}}}return this;};function SliderTools(options) {this.options = util.extend({}, this.constructor.defaultOptions, options)this.init();this.bindEvents();this.diffX = 0;this.flag = false;}SliderTools.VERSION = '1.0.0';SliderTools.defaultOptions = {el: document.body};var proto = SliderTools.prototype = new EventEmitter();proto.constructor = SliderTools;proto.init = function () {this.createSlider();this.getElements();}proto.createSlider = function () {this.options.el.innerHTML = '<div id="slider"><div class="drag_bg"></div><div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div><div class="handler handler_bg"></div></div>';util.addCSS('ul, li {    list-style: none;    }    a {    text-decoration: none;    }    .wrap {    width: 300px;    height: 350px;    text-align: center;    margin: 150px auto;    }    .inner {    padding: 15px;    }    .clearfix {    overflow: hidden;    _zoom: 1;    }    .none {    display: none;    }    #slider {    position: relative;    background-color: #e8e8e8;    width: 300px;    height: 34px;    line-height: 34px;    text-align: center;    }    #slider .handler {    position: absolute;    top: 0px;    left: 0px;    width: 40px;    height: 32px;    border: 1px solid #ccc;    cursor: move;}    .handler_bg {    background: #fff    url("data:image/png;base64,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")    no-repeat center;    }    .handler_ok_bg {    background: #fff    url("data:image/png;base64,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")    no-repeat center;    }    #slider .drag_bg {    background-color: #7ac23c;    height: 34px;    width: 0px;       }    #slider .drag_text {    position: absolute;    top: 0px;    width: 300px;    -moz-user-select: none;    -webkit-user-select: none;    user-select: none;    -o-user-select: none;    -ms-user-select: none;    }    .unselect {    -moz-user-select: none;    -webkit-user-select: none;    -ms-user-select: none;    }    .slide_ok {    color: #fff;    }')}proto.getElements = function () {this.slider = document.querySelector('#slider');this.drag_bg = document.querySelector('.drag_bg');this.handler = document.querySelector('.handler');}proto.bindEvents = function () {var self = this;self.handler.onmousedown = function (e) {self.diffX = e.clientX - self.handler.offsetLeft;util.setClassName(self.slider, 'unselect');document.onmousemove = function (e) {let deltaX = e.clientX - self.diffX;if (deltaX >= self.slider.offsetWidth - self.handler.offsetWidth) {deltaX = self.slider.offsetWidth - self.handler.offsetWidth;self.flag = true;} else if (deltaX <= 0) {deltaX = 0;self.flag = false;} else {self.flag = false;}util.setInlineStyle([self.handler], 'left', deltaX + 'px');util.setInlineStyle([self.drag_bg], 'width', deltaX + 'px');}document.onmouseup = function (e) {util.setClassName(self.slider, '')if (self.flag) {util.setClassName(self.slider, 'slide_ok')util.addClass(self.handler, 'handler_ok_bg')self.handler.onmousedown = nullself.emit('complete')} else {util.setInlineStyle([self.handler], 'left', 0 + 'px');util.setInlineStyle([self.drag_bg], 'width', 0 + 'px');}document.onmousemove = null;document.onmouseup = null;}}}if (typeof exports != 'undefined' && !exports.nodeType) {if (typeof module != 'undefined' && !module.nodeType && module.exports) {exports = module.exports = SliderTools;}exports.SliderTools = SliderTools;} else {root.SliderTools = SliderTools;}
}());let slider = new SliderTools();
slider.on('complete',() => {alert('验证完成');
})

使用

<script src="./SliderTools.js"></script>

或者

import SliderTools from './SliderTools.js'