要从JavaScript函数返回字符串，请使用JavaScript中的return 语句。
您需要运行以下代码来学习如何使用return语句返回字符串-
<html>
<head>
<script>
function concatenate(name, subject) {
var val;
val = name + subject;
return val;
}
function DisplayFunction() {
var result;
result = concatenate('Amit', ' Java');
document.write (result );
}
</script>
</head>
<body>
<p>Click the following button to call the function</p>
<form>
<input type = "button" onclick = "DisplayFunction()" value = "Result">
</form>
</body>
</html>