你对 transclude 函数和 clone 链接函数到底做了什么？

编辑：完全完全改变我的答案并将其标记为“社区维基”（对我来说没有积分），因为当我回答这个问题时我完全错了

正如@Jonah 在下面指出的那样，here is a really good article on the compile option of directives and using the transclusion function

基本思想是编译函数应该返回一个链接函数。您可以使用链接函数中提供的嵌入函数来克隆被嵌入的 DOM 元素，对其进行编译，然后将其插入到需要插入的任何位置。

Here is a better example I've pulled out of my butt on Plunker

compile 函数的想法是它让您有机会根据在创建和调用链接函数之前传递的属性以编程方式更改 DOM 元素。

// a silly directive to repeat the items of a dictionary object.
app.directive('keyValueRepeat', function ($compile){
  return {
    transclude: true,
    scope: {
      data: '=',
      showDebug: '@'
    },
    compile: function(elem, attrs, transclude) {

      if(attrs.showDebug) {                
        elem.append('<div class="debug">DEBUG ENABLED {{showDebug}}</div>');
      }

      return function(scope, lElem, lAttrs) {
        var items = [];
        console.log(lElem);
        scope.$watch('data', function(data) {

          // remove old values from the tracking array
          // (see below)
          for(var i = items.length; i-- > 0;) {
            items[i].element.remove();
            items[i].scope.$destroy();
            items.splice(i,1);
          }

          //add new ones
          for(var key in data) {

            var val = data[key],
                childScope = scope.$new(),
                childElement = angular.element('<div></div>');

            // for each item in our repeater, we're going to create it's
            // own scope and set the key and value properties on it.
            childScope.key = key;
            childScope.value = val;

            // do the transclusion.
            transclude(childScope, function(clone, innerScope) {
              //clone is a copy of the transcluded DOM element content.
              console.log(clone);

              // Because we're still inside the compile function of the directive,
              // we can alter the contents of each output item
              // based on an attribute passed.
              if(attrs.showDebug) {                
                clone.prepend('<span class="debug">{{key}}: {{value}}</span>');
              }

              //append the transcluded element.
              childElement.append($compile(clone)(innerScope));
            });

            // add the objects made to a tracking array.
            // so we can remove them later when we need to update.
            items.push({
              element: childElement,
              scope: childScope
            });

            lElem.append(childElement);
          }
        });
      };
    }
  };
});