JS表白

<div id="main"></div>
        <script>
            let str = `不是在最美好的时光遇见你，<br/>而是遇见你之后都是最美好的时光`;
            let i = 0;
            function init(){
                let main = document.getElementById('main');
                if(i<=str.length){
                    main.innerHTML = str.slice(0,i++) + `_`;
                    setTimeout('init()',300);
                }else{
                    main.innerHTML = str;
                }
            }
            init();
        </script>