function res(){
var di = document.getElementById("xvalue")vaule;
var zhi = document.getElementById("yvalue")value;
var jieguo = Math.pow(di,zhi);
document.getElementById("result").value = jieguo;
}
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1、你的value拼写错误
2、缺少个.
3、getElementById是id的值不是name的值
所以JS要修改为