例一：

    1. function render(template, data) {
    2.   const reg = /\{\{(\w+)\}\}/
    3.   if (reg.test(template)) {
    4.     const name = reg.exec(template)[1]
    5.     template = template.replace(reg, data[name])
    6.     return render(template, data)
    7.   }
    8.   return template
    9. }
    12. let template = '我是:{{name}}，年龄:{{age}}，性别:{{sex}}';
    13. let person = {
    14.   name: 'xiaoming',
    15.   age: 12,
    16.   sex: '女'
    17. }
    19. console.log(render(template, person))
    22. // ==============================================
    24. // 写法二
    26. function render(template, data) {
    27.   const reg = /\{\{(\w+)\}\}/g
    28.   let str = template.replace(reg, (match, key) => data[key])
    29.   return str
    30. }

    例二：

    1. const year = '2021'; 
    2. const month = '10'; 
    3. const day = '01'; 
    5. let template = '${year}-${month}-${day}';
    6. let context = { year, month, day };
    8. const str = render(template)(context); 
    10. console.log(str) // 2021-10-01
    12. function render(template) {
    13.     return function(context) {
    14.         return template.replace(/\$\{(.*?)\}/g, (match, key) => context[key]);
    15.     }
    16. }