重力操作图片移动（小程序）

/** 事件源 */ var _target = {}; /** * 注册事件源 [每个page载入或切换须注册或重新注册事件源 最好是在onShow中注册] */ var register = function (target) { _target = target; } /** * 设置值 */ var _setValue = function (id, key, value) { if (!_target.data[id]) { _target.data[id] = {}; } var change = {}; if (key) { id = id + '.' + key; } change[id] = value; if(!getCurrentPages().pop().data[id]){ getCurrentPages().pop().data[id] ={}; } getCurrentPages().pop().setData(change); // _target.setData(change); } /** * 获取值 */ var _getValue = function (id, key) { if (!_target.data[id]) { return undefined; } return _target.data[id][key]; } /** * style转json */ var _styleToJson = function (value) { var object = {}; var array = value.split(';'); for (var i = 0; i < array.length; i++) { if (array[i].trim().length) { var temp = array[i].split(':'); object[temp[0].trim()] = temp[1].trim(); } } return object; } /** * 格式化style */ var _formatStyle = function (params, value) { // if (value !== undefined && !_isEmpty(value)) { if (value !== undefined){ value = _styleToJson(value); for (var key in value) { if (!params[key]) { params[key] = value[key]; } } } var style = ''; for (var key in params) { style += key + ' : ' + params[key] + '; '; } return style.trim(); } /** * 是否是空对象 */ var _isEmpty = function(obj){ for(var key in obj){ return !1; } return !0; } /** 事件对象 [存储了所有page的事件回调] */ var _eventsObject = {}; /** * 调用事件 */ var callEvent = function (prop,target) { var name = target.name, id = prop.currentTarget.dataset.c_e_id , type = prop.type; if (!_eventsObject[name]) { _eventsObject[name] = {}; } if (!_eventsObject[name][id]) { _eventsObject[name][id] = {}; } var events = _eventsObject[name][id]['events']; if (!events) { return; } if (!events[type]) { return; } var callback = events[type]; if (callback && typeof callback === 'function') { callback(prop,target.data); } } /** * 数组元素移除 */ // Array.prototype.remove = function(val) { // var index = this.indexOf(val); // if (index > -1) { // this.splice(index, 1); // } // }; /** * _coolsite * id :对应wxml中的 data-c_e_id */ var $ = function (id) { return { hasStyle : function (key, val) { var style = this.getStyle(); for (var i in style) { if (i === key && style[i] === val) { return true; } } return false; }, getStyle : function(){ var style = _getValue(id, 'style'); if (style) { style = _styleToJson(style); } return style; }, addStyle : function (params) { for (var key in params) { if (this.hasStyle(key, params[key])) { // delete params[key]; } } _setValue(id, 'style', _formatStyle(params, _getValue(id, 'style'))); return this; }, setStyle : function(params){ // var style = this.getStyle(); // for(var key in params){ // if(this.hasStyle(key,params[key])){ // // this.removeStyle(key,); // delete style[key]; // } // // if(style[key]!="undefined"){ // // this.removeStyle(key,style[key]); // // delete style[key]; // // } // } // _setValue(id,'style',_formatStyle(params,style)); }, removeStyle : function (params) { var style = this.getStyle(); for (var i in params) { if (this.hasStyle(i, params[i])) { delete style[i]; } } _setValue(id, 'style', _formatStyle(style)); return this; }, toggleStyle : function (params) { for (var key in params) { if (this.hasStyle(key, params[key])) { var style = {}; style[key] = params[key]; this.removeStyle(style); delete params[key]; } } this.addStyle(params); return this; }, show : function () { this.removeStyle({'display' : 'none'}); return this; }, hide : function () { this.addStyle({'display' : 'none'}); return this; }, toggle : function () { if (this.hasStyle('display', 'none')) { this.show(); } else { this.hide(); } return this; }, hasClass : function (name) { var classes = _getValue(id, 'class'); if (classes === undefined) { classes = []; } else { classes = classes.split(' '); } if (classes.indexOf(name) > -1) { return true; } return false; }, addClass : function () { var classes = _getValue(id, 'class'); if (classes === undefined) { classes = []; } else { classes = classes.split(' '); } for (var i in arguments) { if (!this.hasClass(arguments[i])) { classes.push(arguments[i]); } } _setValue(id, 'class', classes.join(' ')); return this; }, removeClass : function () { var classes = _getValue(id, 'class'); if (classes === undefined) { classes = ''; } for (var i in arguments) { if(classes.indexOf(arguments[i])!=-1) classes = classes.replace(arguments[i], ''); } _setValue(id, 'class', classes.trim()); return this; }, toggleClass : function () { var classes = _getValue(id, 'class'); if (classes === undefined) { classes = []; } else { classes = classes.split(' '); } for (var i = 0; i < arguments.length; i++) { if (!this.hasClass(arguments[i])) { classes.push(arguments[i]); } else { // classes.remove(arguments[i]); if(classes.indexOf(arguments[i])!=-1){ var index = classes.indexOf(arguments[i]) classes.splice(index, 1); } } } _setValue(id, 'class', classes.join(' ')); return this; }, text : function (str) { _setValue(id, 'text', str); return this; }, attr : function (key, value) { _setValue(id, 'attr.' + key, value); return this; }, value : function (object) { if (typeof object === 'object') { object = JSON.stringify(object); } _setValue(id, 'value', object); return this; }, on : function (type, callback) { var name = _target.name; if (!_eventsObject[name]) { _eventsObject[name] = {}; } if (!_eventsObject[name][id]) { _eventsObject[name][id] = {}; }