<!--good-->
//商品模塊
(function($view) {
    var $merchantPage = $view.find(".merchant_page");
    var $cartPage = $view.find(".cart_page");
    var $shade = $view.find("#shade");
 
    $view
        .on("click", "#check_order", showCart)
        .on("click", ".continue", showMerchant)
        .on("click", ".close", closePage) ;

    function closePage() {
        $shade.hide();
    }
    function showCart() {
        $merchantPage.hide();
        $cartPage.show();
    }
    function showMerchant() {
        $merchantPage.show();
        $cartPage.hide();
    }
 
})($(document.body))

<!--bad-->
$(".element").on('click',function(){
    console.log("aa")
})

$('.element').click(function(){

})