for (let codePoint of 'foo') {
  console.log(codePoint)
}

let greeting = `\`Yo\` World!`;
console.log(greeting);

let greetings=`${{i:5}}`
console.log(greetings);

const tmpl = addrs => `
  <table>
  ${addrs.map(addr => `
    <tr><td>${addr.first}</td></tr>
    <tr><td>${addr.last}</td></tr>
  `).join('')}
  </table>
`;

const data = [
    { first: '<Jane>', last: 'Bond' },
    { first: 'Lars', last: '<Croft>' },
];

console.log(tmpl(data));

let a = 5;
let b = 10;

function tag(s, v1, v2) {
    console.log(s[0]);
    console.log(s[1]);
    console.log(s[2]);
    console.log(v1);
    console.log(v2);
  
    return "OK";
  }
  
tag`Hello ${ a + b } world ${ a * b }`;
等同于
tag(['Hello ', ' world ', ''], 15, 50);

let total = 30;
let msg = passthru`The total is ${total} (${total*1.05} with tax)`;

function passthru(literals) {
    console.log(literals,arguments);

  let result = '';
  let i = 0;

  while (i < literals.length) {
    result += literals[i++];
    if (i < arguments.length) {
      result += arguments[i];
    }
  }

  return result;
}

console.log(msg);
let sender = '<script>alert("abc")</script>'; // 恶意代码
let message =
  SaferHTML`<p>${sender} has sent you a message.</p>`;

function SaferHTML(templateData) {
  let s = templateData[0];
  for (let i = 1; i < arguments.length; i++) {
    let arg = String(arguments[i]);

    // Escape special characters in the substitution.
    s += arg.replace(/&/g, "&amp;")
            .replace(/</g, "&lt;")
            .replace(/>/g, "&gt;");

    // Don't escape special characters in the template.
    s += templateData[i];
  }
  return s;
}

console.log(message);

console.log`123`

var s = "