jsdoc for new transition methods

Author: yyx990803

src/transition/index.js

@@ -62,13 +62,29 @@ exports.removeThenAppend = function (el, target, vm, cb) {
   }, vm, cb)
 }
 
+/**
+ * Append the childNodes of a fragment to target.
+ *
+ * @param {DocumentFragment} block
+ * @param {Node} target
+ * @param {Vue} vm
+ */
+
 exports.blockAppend = function (block, target, vm) {
   var nodes = _.toArray(block.childNodes)
   for (var i = 0, l = nodes.length; i < l; i++) {
     exports.before(nodes[i], target, vm)
   }
 }
 
+/**
+ * Remove a block of nodes between two edge nodes.
+ *
+ * @param {Node} start
+ * @param {Node} end
+ * @param {Vue} vm
+ */
+
 exports.blockRemove = function (start, end, vm) {
   var node = start.nextSibling
   var next