javascript - 项目服务器 OData

Question

如何获取项目成本或自定义字段的值？

// Initialize the current client context.
var projContext = PS.ProjectContext.get_current();

// Get the projects collection.
projects = projContext.get_projects();

//Other Part
var enumerator = projects.getEnumerator();

var enumerator = projects.getEnumerator();

while (enumerator.moveNext()) {
   var project = enumerator.get_current();

    console.log(project.get_cost()); //Not Work! How  get field Duration, for example?

    var html = "<tr><td>" + project.get_name() + "</td></tr>";
     $("#tblProjects").append(html);
}