each jquery

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<div class="first">     <span>投保人数:</span>     <input type="text" id="people_num" placeholder="预计投保人数" value="1">  人 </div> <div class="first" style="height: auto;">     <span class="span2">投保方案:</span>     <div class="button_main">                                     <div class="button" data-price="1000.55">方案一</div>                           <div class="button" data-price="2000">方案二</div>                           <div class="button" data-price="3000">方案三</div>                             </div> </div> <div class="bottom_button" id="to_calculate">     立即计算 </div>

　　

 

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//计算价格 function calculation_price(){     var people_num = parseInt($('#people_num').val());     if(people_num < 0){         console.log("人数错误");         return false;     }     if (!$('.button_main div').hasClass('button_selected')){         $('.button_main .button:first').addClass('button_selected');     }       $('.button').each(function(index){         var _this = $(this);         var _select_price = parseFloat(_this.data('price'));         if(_this.hasClass('button_selected')){             var _select_price = parseFloat(_this.data('price'));             var total_fee = _select_price * people_num;             $('#total_fee').html(total_fee + '元');         }     }); }   // $(document).on('click','#to_calculate',function () { //     $('.calculation_result').fadeIn(); // });   //点击切换方案 $(document).on('click','.button',function () {     if($('.button').has('button_selected')){         $('.button').removeClass('button_selected');     }     $(this).addClass('button_selected');     calculation_price(); }); //变换投保人数 $(document).on('change','#people_num',function(){     var people_num = $('#people_num').val();     console.log(people_num);     if(!(/(^[1-9]\d*$)/.test(people_num))){         alert("投保人数仅可为正整数");         $('#people_num').val('1');         return false;     }     calculation_price(); });