如何在拖动子项时阻止父项的click事件

Here is a sample code:

这是一个示例代码:

$('.bmc-div').click(function(e){
    e.stopPropagation();
    // console.log(e.target);
    if ($(e.target).hasClass('my-sticky')) {

    } else {
        canvas.add_sticky($(this));
    }
});

$('.bmc-div .sticky_container').sortable({
    cursor: 'move',
    revert: true,  
    helper: 'clone',
    // handle: ".element-handler",
    connectWith: '.bmc-div .sticky_container',
    scroll: true,
    cancel: null,
    opacity: 0.7,
    // axis: 'y',
    items: ".my-sticky",
    placeholder : "sticky-placeholder",
    containment: "#main",
    zIndex: 9999,
    start: function(event, ui) {
        event.stopPropagation();
    },
    stop: function(event, ui) {
        event.stopPropagation();
    },
    update: function(event, ui) {
        // update_sortable_position();
    }
}).disableSelection();
$('.bmc-di