var user = "your name";
var s = 'hello ' + user + ', how are you doing';

在Node.js v4中，你可以使用ES6的Template字符串

var my_name = 'John';
var s = `hello ${my_name}, how are you doing`;
console.log(s); // prints hello John, how are you doing

你需要在'(反撇号)而不是'(撇号)内换行字符串

下面是Node.js中的一个多行字符串文本示例。

> let name = 'Fred'
> tm = `Dear ${name},
... This is to inform you, ${name}, that you are
... IN VIOLATION of Penal Code 64.302-4.
... Surrender yourself IMMEDIATELY!
... THIS MEANS YOU, ${name}!!!
...
... `
'Dear Fred,\nThis is to inform you, Fred, that you are\nIN VIOLATION of Penal Code 64.302-4.\nSurrender yourself IMMEDIATELY!\nTHIS MEANS YOU, Fred!!!\n\n'
console.log(tm)
Dear Fred,
This is to inform you, Fred, that you are
IN VIOLATION of Penal Code 64.302-4.
Surrender yourself IMMEDIATELY!
THIS MEANS YOU, Fred!!!


undefined
>

试试JS中的sprintf 或者你可以用这个要点

注意，从2015年开始，模板只使用反引号

https://stackoverflow.com/a/37245773/294884

let a = `hello ${name}`    // NOTE!!!!!!!! ` not ' or "

注意，这是一个反引号，而不是引号。

如果你想要类似的东西，你可以创建一个函数:

function parse(str) {
    var args = [].slice.call(arguments, 1),
        i = 0;

    return str.replace(/%s/g, () => args[i++]);
}

用法:

s = parse('hello %s, how are you doing', my_name);

这只是一个简单的示例，没有考虑不同类型的数据类型(如%i等)或%s的转义。但我希望这能给你们一些启发。我很确定也有库提供了类似的功能。

var user = "your name";
var s = 'hello ' + user + ', how are you doing';