javascript - 如何将功能链接成一个句子

Question

所以我必须编写一个程序，它可以像这样链接函数:name("Adam").place("cinema").movi​​e("xxx") 预期输出应该是这样的:Adam goes to Cinema to watch movie called xxx, what i so far:

    var test = function(name){

        var self = {};
        console.log(name)

        function someFunc(where) {
            console.log("goes to cinema" + where)
            return self;
        }

        function someOtherFunc(what) {
            console.log("to watch movie" + what)
            return self;
        }   

        self.someFunc = someFunc;
        self.someOtherFunc = someOtherFunc;
        return self;

    }
 console.log(test("Adam").someFunc("cinema").someOtherFunc("xxx"));

但它给了我不同行的字符串，我想用一句话来表达，任何帮助将不胜感激。

Answer 1

你可以这样做:

var test = function(message) {

  this.someFunc = function(where) {
    message += ` goes to ${where}`;
    return this; // Allow chaining
  }

  this.someOtherFunc = function(what) {
    message += ` to watch movie ${what}`;
    return this; // Allow chaining
  }

  this.value = function() {
    return message; //End chain
  }

  return this; // Start chain

}
console.log(test("Adam").someFunc("cinema").someOtherFunc("xxx").value());
//Adam goes to cinema to watch movie xxx

---

编辑:

是否可以在没有 .value() 的情况下获得该结果？

您可以覆盖 .toString()。

Every object has a toString() method that is automatically called when the object is to be represented as a text value or when an object is referred to in a manner in which a string is expected. By default, the toString() method is inherited by every object descended from Object. If this method is not overridden in a custom object, toString() returns "[object type]", where type is the object type.

虽然这需要将对象转换为字符串。

var test = function(message) {

  this.someFunc = function(where) {
    message += ` goes to ${where}`;
    return this;
  }

  this.someOtherFunc = function(what) {
    message += ` to watch movie ${what}`;
    return this;
  }

  this.toString = function() {
    return message;
  }

  return this;

}

console.log(`${ test("Adam").someFunc("cinema").someOtherFunc("xxx")}`);