ES6模板字符串和标签模板的应用实例分析

let hello = 'Hello';
let html = '<div>' +
 '<span>'+ hello +'</span>' +
 '</div>';
console.log(html); // <div><span>Hello</span></div>

let name = 'Joh';
let qq = '56655';
function log() {
 return 'Hi there!';
}
let html = `
 <div>
  <ul>
    <li>${ name === 'Joh' ? 'is Joh' : 'not Joh'}</li>
    <li>${qq}</li>
    <li>${log()}</li>
  <ul>
 </div>
`
console.log(html);
/*
// 输出如下html:
<div>
  <ul>
    <li>is Joh</li>
    <li>56655</li>
    <li>Hi there!</li>
  <ul>
</div>
*/

function tag() {
 return 'tag';
}
let name = "Joh";
var res = tag`hello ${name}`;
console.log(res); // tag

function safe(strArr) {
 let res = '';
 console.log(arguments);
 for(var i=0, len = strArr.length; i < len; i++) {
  res += strArr[i].replace(/</g, '&lt;').replace(/>/g, '&gt;');
  if(i < arguments.length -1) {
   res += arguments[i + 1];
  }
 }
 return res;
}
let name = 'Joh';
var result = safe`<p>hello ${name}</p>`;
console.log(result); // &ltp&gt;hello Joh&lt/p&gt;