<div id="exp-percent" class="progress-bar" style="width: 10%;"></div>
页面中的js
var minNum="${student.expMinNum}";
var maxNum="${student.expMaxNum}";
var expNum="${student.expNum}";
var number=(parseInt(expNum)/100)/(parseInt(maxNum)-parseInt(minNum))*100;
var percent="width:"+number+"%";
var div=document.getElementById("exp-percent");
div.setAttribute("style", percent);