本文实例为大家分享了JS面向对象之多选框实现代码，供大家参考，具体内容如下

描述：

JS面向对象——多选框的实现

效果：

实现：

Utile.js

(function () {
  Object.prototype.addProto=function (sourceObj) {
    var names=Object.getOwnPropertyNames(sourceObj);
    for(var i=0;i<names.length;i++){
      var desc=Object.getOwnPropertyDescriptor(sourceObj,names[i]);
      if(typeof desc.value==="object" && desc.value!==null){
        var obj=new desc.value.constructor();
        obj.addProto(desc.value);//把obj当成引用对象带入递归函数继续给obj赋值
        Object.defineProperty(this,names[i],{
          enumerable:desc.enumerable,writable:desc.writable,configurable:desc.configurable,value:obj
        });
        continue;
      }
      Object.defineProperty(this,desc);
    }
    return this;
  };
  Function.prototype.extendClass=function (supClass) {
    function F() {}
    F.prototype=supClass.prototype;
    this.prototype=new F();
    this.prototype.constructor=this;
    this.supClass=supClass.prototype;
    if(supClass.prototype.constructor===Object.prototype.constructor){
      supClass.prototype.constructor=supClass;
    }
  }
})();
var RES=(function () {
  var list={};
  return {
    DATA_FINISH_EVENT:"data_finish_event",init:function (imgDataList,basePath,type) {
      if(imgDataList.length===0) return;
      if(!type) type="json";
      RES.imgDataList=imgDataList.reverse();
      RES.basePath=basePath;
      RES.type=type;
      RES.ajax(basePath+imgDataList.pop()+"."+type)
    },ajax:function (path) {
      var xhr=new XMLHttpRequest();
      xhr.addEventListener("load",RES.loadHandler);
      xhr.open("GET",path);
      xhr.send();
    },loadHandler:function (e) {
      this.removeEventListener("load",RES.loadHandler);
      var key,obj;
      if(RES.type==="json"){
        obj=JSON.parse(this.response);
        key=obj.Meta.image.split(".png")[0];
        list[key]=obj.frames;
      }else if(RES.type==="xml"){
        obj=this.responseXML.children[0];
        key=obj.getAttribute("imagePath").split(".png")[0];
        list[key]=obj;
      }

      if(RES.imgDataList.length===0){
        var evt=new Event(RES.DATA_FINISH_EVENT);
        evt.list=list;
        document.dispatchEvent(evt);
        // Model.instance.menuData=list;
        return;
      }
      RES.ajax(RES.basePath+RES.imgDataList.pop()+"."+RES.type);
    },getNameJSONData:function (name) {
      var fileName=RES.basePath;
      for(var key in list){
        var arr=list[key].filter(function (t) {
          return t.filename===name;
        });
        if(arr.length>0){
          fileName+=key+".png";
          break;
        }
      }
      if(arr.length===0){
        return false;
      }else{
        return {
          file:fileName,w:arr[0].frame.w,h:arr[0].frame.h,x:arr[0].frame.x,y:arr[0].frame.y
        };
      }
    },getNameXMLData:function (name) {
      var fileName=RES.basePath;
      for(var key in list){
        var elem=list[key].querySelector("[n="+name+"]");
        if(elem){
          fileName+=list[key].getAttribute("imagePath");
          break;
        }
      }
      if(!elem) return false;
      return {
        file:fileName,w:elem.getAttribute("w"),h:elem.getAttribute("h"),x:elem.getAttribute("x"),y:elem.getAttribute("y")
      }
    },getImage:function (name) {
      var obj;
      if(RES.type==="json"){
        obj=RES.getNameJSONData(name);
      }else if(RES.type==="xml"){
        obj=RES.getNameXMLData(name)
      }
      if(!obj)return;
      var div=document.createElement("div");
      Object.assign(div.style,{
        width:obj.w+"px",height:obj.h+"px",backgroundImage:"url("+obj.file+")",backgroundPositionX:-obj.x+"px",backgroundPositionY:-obj.y+"px",position:"absolute"
      });
      return div;
    },changeImg:function (elem,name) {
      var obj;
      if(RES.type==="json"){
        obj=RES.getNameJSONData(name);
      }else if(RES.type==="xml"){
        obj=RES.getNameXMLData(name)
      }
      if(!obj)return;
      Object.assign(elem.style,position:"absolute"
      });
    }
  }
})();

UIComponent.js

var CheckBox=(function () {
  function CheckBox(parent) {
    this.checkView=this.init(parent);
  }
  /*
   //ES5 单例
  CheckBox.getInstance=function () {
    if(!CheckBox._instance){
      CheckBox._instance=new CheckBox();
    }
    return CheckBox._instance;
  };*/
  CheckBox.prototype.addProto({
    _label:"",_checked:false,init:function (parent) {
      if(this.checkView) return this.checkView;
      var div=document.createElement("div");
      var icon=RES.getImage("f-checkBox");
      div.appendChild(icon);
      var label=document.createElement("span");
      div.style.position=icon.style.position=label.style.position="relative";
      icon.style.float=label.style.float="left";
      label.textContent="";
      Object.assign(label.style,{
        fontSize:"16px",lineHeight:"20px",marginLeft:"5px",marginRight:"10px"
      });
      var h=RES.getNameXMLData("f-checkBox").h;
      icon.style.top=(20-h)/2+"px";
      div.appendChild(label);
      parent.appendChild(div);
      this.clickHandlerBind=this.clickHandler.bind(this);
      div.addEventListener("click",this.clickHandlerBind);
      return div;
    },clickHandler:function (e) {
      this.checked=!this.checked;
    },set label(value){
      this._label=value;
      this.checkView.lastElementChild.textContent=value;
    },get label(){
      return this._label;
    },set checked(value){
      if(this._checked===value)return;
      this._checked=value;
      if(value){
        RES.changeImg(this.checkView.firstElementChild,"f-checkBox-active");
      }else{
        RES.changeImg(this.checkView.firstElementChild,"f-checkBox");
      }
      this.checkView.firstElementChild.style.position="relative";
      this.dispatchMessage(value);
    },dispatchMessage:function (value) {
      var evt=new Event("change");
      evt.checked=value;
      evt.elem=this;
      document.dispatchEvent(evt);
    },get checked(){
      return this._checked;
    }
  });
  return CheckBox;
})();

var Radio=(function () {
  function Radio(parent,groupName) {
    this.constructor.supClass.constructor.call(this,parent);
    this.groupName=groupName;
    this.checkView.self=this;
    this.checkView.setAttribute("groupName",groupName);
  }

  Radio.extendClass(CheckBox);

  Radio.prototype.addProto({
    clickHandler:function (e) {
      // console.log(Model.instance.menuData);
      if(this.checked)return;
      var list=document.querySelectorAll("[groupName="+this.groupName+"]");
      for(var i=0;i<list.length;i++){
        list[i].self.checked=false;
      }
      this.checked=true;
    },dispatchMessage:function (value) {
      if(!value)return;
      this.constructor.supClass.dispatchMessage.call(this,value);
    }
  });
  return Radio;
})(); 

html

<!DOCTYPE html>
<html lang="en">
<head>
  <Meta charset="UTF-8">
  <title>Title</title>
  <script src="js/Utile.js"></script>
  <script src="js/UIComponent.js"></script>
</head>
<body>
  <script>
    document.addEventListener(RES.DATA_FINISH_EVENT,init);
    RES.init(["new_icon"],"img/","xml");

    function init() {
      var elem=document.createDocumentFragment();
      document.addEventListener("change",changeHandler);
      var check=new CheckBox(elem);
      check.checked=true;
      check.label="男";
      var check1=new CheckBox(elem);
      check1.label="女";
      document.body.appendChild(elem);

    }

    function changeHandler(e) {
      console.log(e);
    }

  </script>
</body>
</html>

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