如何将值从jsp页面传递到javascript页面？

Question

我的jsp文件中有以下代码：

     int hours=5;
     int minutes=3;
     int seconds=2;

<h3 id="c_down">TIME LEFT <br> <%=hours%> : <%=minutes%> : <%=seconds%> </h3>
<script src="countdown.js"></script>

这是我的javascript文件(countdown.js)：

let minutes=
let seconds = 
let hours= 


let timming_onSeconds=seconds+minutes*60+hours*3600;

const cd=document.getElementById('c_down');


setInterval(uptade_countdown, 1000);

function uptade_countdown() {


    hours=Math.floor(timming_onSeconds/3600);
    minutes=Math.floor((timming_onSeconds%3600)/60);
    seconds=(timming_onSeconds%3600)%60;


    seconds=seconds <= 9 ? "0"+seconds : seconds;
    minutes=minutes <= 9 ? "0"+minutes : minutes;
    hours=hours <= 9 ? "0"+hours : hours;


    cd.innerHTML = `TIME LEFT <br> ${hours} : ${minutes} : ${seconds}`;


   timming_onSeconds--;


}

如何从jsp文件中的秒数、分钟数、小时数到javascript文件中的秒数、分钟数、小时数？

Answer 1

您可以使用内联脚本设置变量：

<h3 id="c_down">TIME LEFT <br> <%=hours%> : <%=minutes%> : <%=seconds%> </h3>
<script>
let minutes = <%=minutes%>;
let seconds = <%=seconds%>;
let hours = <%=hours%>;
</script>
<script src="countdown.js"></script>

因此，从countdown.js中删除此块

let minutes=
let seconds = 
let hours=