Javascript 流星助手应该永远是功能吗？

流星助手必须是功能吗？我认为它们可以直接分配给空格键可以理解的任何东西（数组、字符串、数字等）。但这并不正确：

Template.myTemplate.helpers = ({
    'tabButtons': [{
        title: "Active Topics",
        link: "/dashboard/topic-builder/active",
        bootstrap: "col-xs-6",
        active: isActive("activeTopics", Template.currentData())
    }, {
        title: "Draft Topics",
        link: "/dashboard/topic-builder/drafts",
        bootstrap: "col-xs-6",
        active: isActive("draftTopics", Template.currentData())
    }]
}

“工作不正常”是指在

myTemplate

中未定义“tabbutions”。但是，这样做很好：

Template.myTemplate.helpers = ({
    'tabButtons': function(){
        return [{
            title: "Active Topics",
            link: "/dashboard/topic-builder/active",
            bootstrap: "col-xs-6",
            active: isActive("activeTopics", Template.currentData())
        }, {
            title: "Draft Topics",
            link: "/dashboard/topic-builder/drafts",
            bootstrap: "col-xs-6",
            active: isActive("draftTopics", Template.currentData())
    }];
}

奇怪的是，我的代码中的其他地方也使用了同样的语法。例如，这：

Template.myTemplate2.helpers({

    'sectionButtons': [{
        title: "Matrix",
        icon: "fa-table",
        link: "/dashboard/overview",
        bootstrap: "col-xs-2"
    }, {
        title: "Topic Builder",
        icon: "fa-database",
        link: "/dashboard/topic-builder",
        bootstrap: "col-xs-2"
    }, {
        title: "Alerts",
        icon: "fa-exclamation-circle",
        link: "/dashboard/alerts",
        bootstrap: "col-xs-2"
    }, {
        title: "Story",
        icon: "fa-book",
        link: "/dashboard/story-of-the-day",
        bootstrap: "col-xs-2"
    }, {
        title: "Add Admin",
        icon: "fa-plus",
        link: "/dashboard/addadmin",
        bootstrap: "col-xs-2"
    }, {
        title: "Settings",
        icon: "fa-cog",
        link: "/dashboard/settings",
        bootstrap: "col-xs-2"
    }]

});

'tabButtons': [{
    title: "Active Topics",
    link: "/dashboard/topic-builder/active",
    bootstrap: "col-xs-6",
    active: isActive("activeTopics", "activeTopics")
}, {
    title: "Draft Topics",
    link: "/dashboard/topic-builder/drafts",
    bootstrap: "col-xs-6",
    active: isActive("draftTopics", "draftTopics")
}]

在

myTemplate2

中未定义。我已经检查了具有相同名称的全局帮助程序，以及传递给每个具有相同名称的上下文的内容，只是为了确保其他内容没有返回未定义和重写我的函数，但这肯定不是导致问题的原因

---

这到底是怎么回事？

我知道了。问题出在

Template.currentData（）

，而不是我在使用函数。例如，这：

Template.myTemplate2.helpers({

    'sectionButtons': [{
        title: "Matrix",
        icon: "fa-table",
        link: "/dashboard/overview",
        bootstrap: "col-xs-2"
    }, {
        title: "Topic Builder",
        icon: "fa-database",
        link: "/dashboard/topic-builder",
        bootstrap: "col-xs-2"
    }, {
        title: "Alerts",
        icon: "fa-exclamation-circle",
        link: "/dashboard/alerts",
        bootstrap: "col-xs-2"
    }, {
        title: "Story",
        icon: "fa-book",
        link: "/dashboard/story-of-the-day",
        bootstrap: "col-xs-2"
    }, {
        title: "Add Admin",
        icon: "fa-plus",
        link: "/dashboard/addadmin",
        bootstrap: "col-xs-2"
    }, {
        title: "Settings",
        icon: "fa-cog",
        link: "/dashboard/settings",
        bootstrap: "col-xs-2"
    }]

});

'tabButtons': [{
    title: "Active Topics",
    link: "/dashboard/topic-builder/active",
    bootstrap: "col-xs-6",
    active: isActive("activeTopics", "activeTopics")
}, {
    title: "Draft Topics",
    link: "/dashboard/topic-builder/drafts",
    bootstrap: "col-xs-6",
    active: isActive("draftTopics", "draftTopics")
}]

很好

当我直接分配数组时，我认为

Template.currentData（）

可以工作，因为它是在助手中定义的。但是，使用

template.data

和

template.currentData（）

似乎只有在直接传递给助手的函数中定义时才起作用。现在想想，这是有道理的，因为没有办法修改定义了

tabButtons

的上下文，因为我包含

Template.currentData（）

的行在传递给

Template.topicBuilder.helpers

之前就已经执行了