container{   margin: 20px auto;   padding:0 15px;   width: 50%;    height:300px;   box-sizing: border-box;    }  .text-container{   display: inline-block;   float:left;   width: 15%;   height: 32px;   line-height: 32px;   box-sizing: border-box;  }  .selectContainer{   width: 70%;   height:200px;   float:left;   position: relative;   padding:0;   margin:0;   box-sizing: border-box;  }  .selectedContent{   width:85%;   height: 25px;   float:left;     }  .dropDown-toggle{   width:14%;   height:31px;   line-height: 31px;   text-align: center;   border: 1px solid silver;   border-left:none;   float:left;   padding:0;   margin:0;   box-sizing: border-box;   cursor: pointer;  }  .dropDown-menu{   margin:0;   padding:0 15px 10px;   width:100%;   border:1px solid silver;   border-top: none;   box-sizing: border-box;   list-style: none;   position: absolute;   top:31px;   right:0;  }  .items{   margin-top:8px;   padding: 2px;   cursor: pointer;  }  .items:hover{   background: #ddd;  }  .isSelectedText{   display: inline-block;   width:90%;  }  .dsn{   display: none;  }

<div class="container"> <span class="text-container">最愛的水果</span> <div class="multipleSelect selectContainer">  <input type="text" class="selectedContent">  <div class="dropDown-toggle">選擇</div>  <ul class="dropDown-menu dsn">   <li class="items">    <span class="isSelectedText">蘋果</span>    <span class="isSelected"><input type="checkbox"></span>   </li>   <li class="items">         <span class="isSelectedText">梨</span>    <span class="isSelected"><input type="checkbox"></span>   </li>   <li class="items">    <span class="isSelectedText">橘子</span>    <span class="isSelected"><input type="checkbox"></span>   </li>   <li style="text-align: right">    <button type="button" class="confirmSelect">確定</button>   </li>  </ul> </div></div>

$('.isSelected input[type=checkbox]').on('click', function(){   var selectedItems = $(this).parents('.dropDown-menu').prevAll('.selectedContent').val().split(' ');   var thisItem = $(this).parent().prev().text();   var isExisted = 0;   var isChecked = $(this).is(':checked');   if(isChecked){    selectedItems.map(function(item, index){     if(item === thisItem){      isExisted++     }    });    if(!isExisted){     selectedItems.push(thisItem)    }   }   else{    selectedItems.map(function(item, index){     if(item === thisItem){      selectedItems.splice(index, 1);     }    });   }   $(this).parents('.dropDown-menu').prevAll('.selectedContent').val(selectedItems.join(' '));  })  $('.confirmSelect').on('click', function(){   $(this).parents('.dropDown-menu').addClass('dsn');  })  $('.dropDown-toggle').on('click', function(){   $(this).next().toggleClass('dsn')  });