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

这样做:

s = 'hello ' + my_name + ', how are you doing'

更新

使用ES6，你也可以这样做:

s = `hello ${my_name}, how are you doing`

试试JS中的sprintf 或者你可以用这个要点

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

const格式=(…args) = > args.shift () .replace (/ % ([jsd]) / g, x = > x = = =“% j”?JSON.stringify(args.shift()): const name = 'Csaba' const格式化= format('Hi %s，今天是%s，您的数据是%j'，名称，日期()，{数据:{国家:'匈牙利'，城市:'布达佩斯'}}) console.log(格式化)

var print = console.log;

function dformat(str, ...arr) {
  return str.replace(/%(\d+)/g, function(_,i) {
    return arr[--i];
  });
}

function wformat(str, dict) {
  return str.replace(/%(\w+)/g, function(_,k) {
    return dict[k];
  });
}

function sformat(str, dict) {
  return str.replace(/\$(\w+)/g, function(_,m) {
    return dict[m];
  });
}

function tformat(str, dict) {
  return str.replace(/\${(\w+)}/g, function(_,m) {
    return dict[m];
  });
}

print(1, dformat("uid:%1, name:%2", 120, "someone") )
print(2, wformat("color: %name", {name: "green"})   )
print(3, sformat("img: $url", {url: "#"})   )
print(4, tformat("${left} ${right}", {right:"1000", left: "7fff"}) )