make download button available

index.html

@@ -86,14 +86,14 @@ <h4> <span class="fa fa-external-link"></span> 相关链接 </h4>
 		        <h4 class="modal-title" id="isoModalLabel">获取安装镜像</h4>
 		      </div>
 		      <div class="modal-body">
-						<p>选择安装发行版： <select class="selectpicker" id="isodistro" onchange="switchDistro()"></select></p>
+						<p>选择安装发行版： <select class="selectpicker" id="isodistro" ></select></p>
 						<p>选择发行版版本： <select class="selectpicker" id="isoversion">
 								<option value="none">-</option>
 						</select>
 						</p>
 		      </div>
 		      <div class="modal-footer">
-		        <button type="button" class="btn btn-primary">下载</button>
+		        <button type="button" class="btn btn-primary" id="btn_download">下载</button>
 		      </div>
 		    </div>
 		  </div>

static/js/index.es6

@@ -112,8 +112,17 @@ var refreshISOList = () => {
 	});
 }
 
+$('#isodistro').change(switchDistro);
+$('#btn_download').click(() => {
+	var distro = document.getElementById("isodistro");
+	var version = document.getElementById("isoversion");
+	var i = distro.selectedIndex;
+	var j = version.selectedIndex;
+	var link = isoinfo[i].urls[j].url;
+	window.open(link);
+	$('#isoModal').modal('toggle');
+});
 refreshISOList();
-
 refreshMirrorList();
 
 });