使用String.split、String.replace、Array.map和Array.join函数的扩展解决方案：

var content = {"timeOfTheDay" : "evening", "name" : "Jack", "city" : "New York", "age" : "25"},
    str = "Good $timeOfTheDay$, $name$", replaced = "";
var parts = str.split(/(\$\w+?\$)/g).map(function(v) {
    replaced = v.replace(/\$/g,"");
    return content[replaced] || replaced; 
});
console.log(parts.join(""));  // "Good evening, Jack"

字符串
其他示例：

...
str = "$name$ lives in $city$. He is $age$";
...
console.log(parts.join(""));  // "Jack lives in New York. He is 25"

型

只需使用String.prototype.replace函数

var content = { "timeOfTheDay": "evening", "name": "Jack", "city": "New York", "age": "25", }
var str = "Good $timeOfTheDay$, $name$"
var result = str.replace('$timeOfTheDay$', content.timeOfTheDay)
                .replace('$name$', content.name);
document.write(result);

字符串

var content = { "timeOfTheDay" : "evening",
                "name" : "Jack",  
                "city" : "New York",  
                "age" : "25",  
              }
              
document.getElementById('greeting').placeholder = 'Good ' + content.timeOfTheDay + ', ' +content.name;

个字符

这个库可以用来替换占位符。它也可以用来递归地替换占位符。https://github.com/tarangkhandelwal/substitutor.js
例如：
nameJson= {“first”：“John”，“last”：“Doe”}
var fullName = substitutor（'我的名字是{first} {last} '，nameJson）;

如果你想使用${var}转换：

var content = {
  timeOfTheDay: 'evening',
  name: 'Jack',
  city: 'New York',
  age: '25'
};
var str = 'Good ${timeOfTheDay}, ${name}. I am from ${city}, ${age} years old';
var parts = str.split(/(\$\{\w+?})/g).map(function(v) {
  var replaced = v.replace(/\$\{(\w+?)}/g, '$1');
  return content[replaced] || v;
});
console.log(parts.join(''));

字符串
输出

Good evening, Jack. I am from New York, 25 years old

型

将我的解决方案导出到一个方便的函数中，您可以使用任何字符串调用。

export function getValue(text, values) {
  return text.replace(/\$\w+\$/g, (match) => {
    const variable = match.slice(1, -1);
    return values[variable] || match;
  });
}

字符串

用法

var content = {
  timeOfTheDay: "evening",
  name: "Jack",
  city: "New York",
  age: "25",
};
const jsonString = "Good $timeOfDay$ $name$ from $city$"
getValue({ jsonString, {
  "timeOfDay": content.timeOfTheDay,
  "name": content.name,
  "city": content.city
  }
})

Result: "Good evening John from New York"

的数据