//綁定了li 或者tr這類元素，元素里的子元素有checkbox這中的的話會觸發該點擊事件和它自身點擊事件導致沒有選中
$(".list").on("click",".item",function(){
let children = $(this).children()["0"];
console.log(children);
if (children.checked) {
children.checked = false;
}
else {
children.checked = true;
}
});
$(
"input[type='checkbox']").click(function(e){
e.stopPropagation();
});
如果是動態加載元素的話
$(".list").on("click","input[type='checkbox']",function(){
e.stopPropagation();
});