Improve table ajax dataSource

1. Add ajax data params support
2. improve dataSource.clone for new config

components/table/demo/ajax.md

@@ -60,7 +60,7 @@ var dataSource = new Table.DataSource({
   }
 });
 
-var Test=React.createClass({
+var Test = React.createClass({
   getInitialState() {
     return {
       dataSource: dataSource
@@ -68,14 +68,28 @@ var Test=React.createClass({
   },
   refresh() {
     this.setState({
-      dataSource: this.state.dataSource.clone()
+      dataSource: dataSource.clone()
+    });
+  },
+  changeAndRefresh() {
+    // 可以修改原来的 dataSource 再发请求
+    this.setState({
+      dataSource: dataSource.clone({
+        data: {
+          city: 'hz'
+        }
+      })
     });
   },
   render() {
     return <div>
       <Table columns={columns} dataSource={this.state.dataSource} />
       <button className="ant-btn ant-btn-primary" onClick={this.refresh}>
-        外部重新加载数据
+        重新加载数据
+      </button>
+      &nbsp;
+      <button className="ant-btn" onClick={this.changeAndRefresh}>
+        加载 city=hz 的数据
       </button>
     </div>;
   }

components/table/index.jsx

@@ -23,6 +23,7 @@ class DataSource {
     this.getParams = config.getParams || noop;
     this.getPagination = config.getPagination || noop;
     this.headers = config.headers || {};
+    this.data = config.data || {};
   }
 
   constructor(config) {
@@ -31,10 +32,12 @@ class DataSource {
     }
   }
 
-  clone() {
-    var d = new DataSource();
-    d.init(this.config);
-    return d;
+  clone(config) {
+    if (config) {
+      return new DataSource(objectAssign(config, this.config));
+    } else {
+      return this;
+    }
   }
 }
 
@@ -358,9 +361,10 @@ var AntTable = React.createClass({
       }
       // remote 模式使用 this.dataSource
       let dataSource = this.getRemoteDataSource();
+      let buildInParams = dataSource.getParams.apply(this, this.prepareParamsArguments(state)) || {};
       return jQuery.ajax({
         url: dataSource.url,
-        data: dataSource.getParams.apply(this, this.prepareParamsArguments(state)) || {},
+        data: objectAssign(buildInParams, dataSource.data),
         headers: dataSource.headers,
         dataType: 'json',
         success: (result) => {