<!DOCTYPE html>
<html>
<body>
<p>显示""的布尔值：</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = "";
document.getElementById("demo").innerHTML = Boolean(x);
}
</script>
</body>
</html>
你的E-mail:
网页地址:
描述: