要在JavaScript中解码URL，请使用decodeURI()方法。
您可以尝试运行以下代码来解码URL-
<!DOCTYPE html>
<html>
<body>
<button onclick="display()">Check</button>
<p id="demo"></p>
<script>
function display() {
var uri = "welcome msg.jsp?name=åmit&sub=programming";
//首先编码
var encode = encodeURI(uri);
var decode = decodeURI(encode);
var result = "Encode= " + encode + "<br>" + "Decode= " + decode;
document.getElementById("demo").innerHTML = result;
}
</script>
</body>
</html>