写个递归，循环遍历！

Code:

function getRelationship(data) {
  var retData = new Array();
  for (var i in data.node) {
    var dataItem = {
      name: data.node[i].name,
      children: []
    };
    for (var j in data.link) {
      if (data.link[j].source == i) {
        var nodeName = data.node[data.link[j].target].name;
        dataItem.children.push({
          name: nodeName
        }); 
      }
    }
    retData.push(dataItem);
  }

  return retData;
}

var ret = getRelationship(data);

Result:

[ { name: 'node1', children: [ [Object], [Object] ] },
  { name: 'node2', children: [] },
  { name: 'node3', children: [] } ]