在jQuery标签中包装新的元素，并应用当时的事件处理程序。这是比使用某些复杂的jQuery选择器在元素已被插入到DOM中之后分配事件处理程序的一种更清洁和更有效的方法：

  //这行将在内存中创建您的元素，但不会将其插入DOM 
 var newElmt = $（'< li>'+ label +'< a href =＃remove_' + ID + '&GT; [删除]&LT; / A&GT;&LT; /立GT;'）; 

 //此时您可以应用jQuery风格的事件处理程序
 newElmt.on（'click'，function（e）{

 alert（' '+ $（this）.attr（'href'）。substr（8））; 
 event.preventDefault（）; 
}）; 

 //在
 $（'＃list ol'）之前插入元素。append（newElmt）; 
 

I'm trying to add new element to ordered list with link for it's removal:

$('#list ol').append('<li>' + label + ' <a href="#remove_'+id+'">[remove]</a></li>');

but this is not working:

$('a[href^="#remove"]').on('click', function(event){
    alert('Removing: '+$(this).attr('href').substr(8));
    event.preventDefault();
});

Any idea why?

Wrap up the new element in jQuery tags and apply the event handler at that time. This is a cleaner and more efficient approach than using somewhat complicated jQuery selectors to assign the event handler after the element has already been inserted into the DOM:

//this line will create your element in memory, but not insert it to the DOM
var newElmt = $('<li>' + label + ' <a href="#remove_'+id+'">[remove]</a></li>');

//you can apply jQuery style event handlers at this point
newElmt.on('click',function(e) {

    alert('Removing: '+$(this).attr('href').substr(8));
    event.preventDefault();
});

//insert the element as you were before
$('#list ol').append(newElmt);