使用underscore.js模板评估小胡子样式函数(Mustache style function evaluation with underscore.js template)

使用underscore.js模板评估小胡子样式函数(Mustache style function evaluation with underscore.js template)

是否可以使用带有Mustache样式函数调用的underscore.js？ underscore.js 手册有一个如何支持Mustache语法的示例：

_.templateSettings = { interpolate : /\{\{(.+?)\}\}/g }; var template = _.template("Hello {{ name }}!"); template({name : "Mustache"}); => "Hello Mustache!"

但是，除了变量之外，mustache.js还会自动检测对象何时是函数，然后对其进行求值。 从mustache.js手册：

var view = { title: "Joe", calc: function () { return 2 + 4; } }; var output = Mustache.render("{{title}} spends {{calc}}", view);

但是，使用underscore.js渲染后者导致：

var template = _.template("{{title}} spends {{calc}}"); template(view); "Joe spends function () { return 2 + 4; }"

Is it possible to use underscore.js with Mustache style function calls? The underscore.js manual has an example how to support Mustache syntax:

_.templateSettings = { interpolate : /\{\{(.+?)\}\}/g }; var template = _.template("Hello {{ name }}!"); template({name : "Mustache"}); => "Hello Mustache!"

However, apart from variables mustache.js also automatically detects when the object is a function and then evaluates it. From the mustache.js manual:

var view = { title: "Joe", calc: function () { return 2 + 4; } }; var output = Mustache.render("{{title}} spends {{calc}}", view);

However, using underscore.js to render the latter results in:

var template = _.template("{{title}} spends {{calc}}"); template(view); "Joe spends function () { return 2 + 4; }"

最满意答案

Underscore的模板函数不执行类型检查，并始终返回属性/变量的值。

https://github.com/documentcloud/underscore/blob/master/underscore.js#L1161

但是您可以使用下划线模板evaluate块来运行javascript函数。

所以你可以做到以下几点：

var template = _.template("<% var spend = calc() %>{{title}} spends {{ spend }}");

这显然是使用默认的ERB样式评估块，所以如果您更愿意使用不同的语法，请_.templateSettings在_.templateSettings编写自己的regex进行evaluate 。

Underscore's template function doesn't perform type checking and always returns the value of the property/variable.

https://github.com/documentcloud/underscore/blob/master/underscore.js#L1161

But you can use the underscore template evaluate block to run javascript functions.

So you can do the following:

var template = _.template("<% var spend = calc() %>{{title}} spends {{ spend }}");

That's obviously using the default ERB-style evaluation block, so feel free to write your own regex for evaluate in _.templateSettings if you'd rather use a different syntax.