这篇文章主要为大家详细介绍了微信小程序下拉框组件的使用方法，写的十分的全面细致，具有一定的参考价值，对此有需要的朋友可以参考学习下。如有不足之处，欢迎批评指正。
适用场景
1、省市三级联动
2、出生日期选择
3、性别选择
4、一般性的下拉选择等
一、省市三级联动使用
注意mode = region，以及value = “一维数组”
//.wxmlpicker mode="region" bindchange="bindViewEvent" data-model="component"data-method="bindSelect" data-name="region" value="{{region}}" custom-item="{{customItem}}"view class="picker" 当前选择：{{region[0]}}，{{region[1]}}，{{region[2]}}/view/picker二、出生日期选择
注意mode = date，以及value = “日期字符串”
picker mode="date" value="{{date}}" start="2015-09-01" end="2017-09-01" bindchange="bindViewEvent" data-model="component" data-method="bindSelect" date-mode="date" data-name="date" view class="picker" {{date}} /view三、性别选择
注意，不填mode默认为selector，range=”一维数组”，value=”当前选中索引”
picker bindchange="bindViewEvent" data-model="component" data-method="bindSelect" data-name="index" value='{{index}}' range="{{gender}}" view class="label-right" {{gender[index]}} /view/picker以上都需要在.js里设置相关初始变量！
var app = getApp(); data: { region:['湖南','长沙','岳麓'], date:'2010-10-10', gender:['男','女'], index:0 }, //欢迎加入前端全栈开发交流圈一起吹水聊天学习交流：619586920 bindViewEvent:function(e){ app.process(this,e); }相关js类
//component.jsconst select = require('../component/select.js');const upload = require('../component/upload.js'); class component{ constructor(com, that) { this.com = com; this.that = that; } //绑定下拉框选择事件 bindSelect(data){ let self = this; let mode = data.currentTarget.dataset.mode; let name = data.currentTarget.dataset.name; let picker = new select({ that: self.that, mode: mode, name: name }); picker.change(data.detail.value); } //点击事件，传递参数为e.currentTarget.dataset bindImageChoose(data){ //图片上传 this.uploader = new upload({ that: that, name: data.name, mode: data.mode, count: data.count || 9 }); this.uploader.choose(); } //欢迎加入前端全栈开发交流圈一起吹水聊天学习交流：619586920 bindImageDel(data){ //图片上传 this.uploader = new upload({ that: that, name: data.name, mode: data.mode, count: data.count || 9 }); this.uploader.del(data.index); } }module.exports = component; //select.js/** 下拉框对象*/class picker{ constructor(data){ this.that = data.that; this.name = data.name || 'date'; this.mode = data.mode || 'selector'; } show(name,data){ let view = {}; view[name] = data; this.that.setData(view); } change(data){ let self = this; self.show(self.name, data); }}module.exports = picker; //upload.jsclass picUploader { constructor(data) { this.that = data.that; this.name = data.name; this.mode = data.mode || 1; this.count = this.model == 1 ? 1 : data.count || 9; } //欢迎加入前端全栈开发交流圈一起吹水聊天学习交流：619586920 /* * 选择图片 */ choose() { const self = this; wx.chooseImage({ count: (self.count - self.that.data[self.name].length), sizeType: ['original', 'compressed'], sourceType: ['album', 'camera'], success: function (res) { var tempFilePaths = res.tempFilePaths; self.append(tempFilePaths); } }) } /* * 显示图片 */ show() { let self = this; let view = {}; view[self.name] = self.that.data[self.name]; self.that.setData(view); } /* * 追加图片 */ append(data) { const self = this; for (let i = 0; i data.length; i++) { self.that.data[self.name].push(data[i]); } self.show(); } //欢迎加入前端全栈开发交流圈一起吹水聊天学习交流：619586920 /* * 删除图片 */ del(index) { let self = this; self.that.data[self.name].splice(index, 1); self.show(); } }module.exports = picUploader;结语
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