Express/Jade/Pug:调用javascript对象的函数 [英] Express / Jade / Pug: Calling a javascript object's functions

问题描述

虽然我可以传递对象的数据，但我不知道如何传递/调用对象的函数.

While I can pass an object's data, I don't know how to pass/call an object's functions.

route.js:

router.get('/', function(req, res, next) {
  let test = {}; // passing an object called test
  test.hello = function() { //the test object has a method I want to
    console.log('hello');   //call on the browser
  }

  res.render('home.jade', { test:test });

在.jade页面上:

//- let test = !{test}; //renders as [object Object]
    let test = !{JSON.stringify(test, null, 4)}; //renders empty obj
    test.hello();
    console.log('test', test);

控制台消息:

Uncaught TypeError: test.hello is not a function

渲染的源文件:

//- let test = [object Object];
let test = {};
test.hello();
console.log('test', test);

适用于my.jade文件(不需要的内容)的示例:

    let test = {};
    test.hello = #{test.hello};
    test.hello();

这将消除"hello".但是，我认为没有这种解决方法，就有一种方法可以传递和调用对象的函数.

This will console out 'hello'. However, I imagine that there is a way to pass and call an object's function without this workaround.

感谢您的帮助.

推荐答案

JSON.stringify将剥离函数，因为JSON格式不支持函数/方法.来自 MDN :

JSON.stringify will strip away functions since JSON format does not support functions/methods. From MDN:

函数不是有效的JSON数据类型，因此它们将不起作用. 但是，如果先转换为字符串(例如， 通过该函数的toString方法).另外，一些物体 例如Date将是JSON.parse()之后的字符串.

Functions are not a valid JSON data type so they will not work. However, they can be displayed if first converted to a string (e.g. in the replacer), via the function's toString method. Also, some objects like Date will be a string after JSON.parse().

从技术上讲，您可以使用eval将结果字符串评估为函数，尽管不建议这样做.

Technically you can use eval to evaluate the resulting string to a function, though this is not recommended.

这篇关于Express/Jade/Pug:调用javascript对象的函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！