替换更多的ES6版本的@Chris Nielsen的帖子。

String.prototype.supplant = function (o) {
  return this.replace(/\${([^\${}]*)}/g,
    (a, b) => {
      var r = o[b];
      return typeof r === 'string' || typeof r === 'number' ? r : a;
    }
  );
};

string = "How now ${color} cow? {${greeting}}, ${greeting}, moo says the ${color} cow.";

string.supplant({color: "brown", greeting: "moo"});
=> "How now brown cow? {moo}, moo, moo says the brown cow."

我可以给你们举个例子:

函数fullName(first, last) { let fullName = first + " " + last; 返回fullName; } 函数fullNameStringInterpolation(first, last) { let fullName = ' ${first} ${last} '; 返回fullName; } console.log('Old School: ' + fullName('Carlos'， 'Gutierrez')); console.log('New School: ' + fullNameStringInterpolation('Carlos'， 'Gutierrez'));

你可以使用Prototype的模板系统，如果你真的想用大锤敲开一个坚果:

var template = new Template("I'm #{age} years old!");
alert(template.evaluate({age: 21}));

如果您想在console.log输出中插入，那么只需

console.log("Eruption 1: %s", eruption1);
                         ^^

这里，%s是所谓的“格式说明符”。log内置了这种插值支持。

找不到我要找的东西，然后找到了

如果你使用的是Node.js，有一个内置的utipackage，它有一个format函数，工作方式是这样的:

util.format("Hello my name is %s", "Brent");
> Hello my name is Brent

巧合的是，在Node.js -中，这也被内置到console.log版本中

console.log("This really bad error happened: %s", "ReferenceError");
> This really bad error happened: ReferenceError

扩展Greg Kindel的第二个答案，你可以写一个函数来消除一些样板文件:

var fmt = {
    join: function() {
        return Array.prototype.slice.call(arguments).join(' ');
    },
    log: function() {
        console.log(this.join(...arguments));
    }
}

用法:

var age = 7;
var years = 5;
var sentence = fmt.join('I am now', age, 'years old!');
fmt.log('In', years, 'years I will be', age + years, 'years old!');