Uncaught ReferenceError: is not defined at HTMLAnchorElement.onclick

原因： 字符串没有添加引号造成的
Uncaught ReferenceError:  is not defined at HTMLAnchorElement.onclick 

var msg= "类型：" + source_type_name + "<br>单号：<a href='javascript:void(0)' onclick='rOrderDetail("+"\""+source_id+"\""+","+city_id+")'>" + source_id +"</a>";