Ecma无法得到当前web对象

var ctx = new SP.ClientContext.ClientContext();//get_current();         this.web = ctx.get_web();         var list=this.web.get_lists().getByTitle("commendation");//对应列表名称         var camlQuery = new SP.CamlQuery();          camlQuery.set_viewXml("<View><Query><Where><Gt>" +"<FieldRef Name='Created' />" +"<Value Type='DateTime'>2008-01-1T00:00:00Z</Value>" + "</Gt></Where></Query></View>");         listItemCollection = list.getItems(camlQuery);                ctx.executeQueryAsync(Function.createDelegate(this, this.onUpdate),                Function.createDelegate(this, this.onFail));

代码是写在test.js中.并在主页的webpart(Content Editor)引用

要等　sp.js　加载完成的，initialize是你要执行的函数名

ExecuteOrDelayUntilScriptLoaded(initialize, "sp.js");