这样就算会了PHP么？-7

<script language="javascript">
    function calculate(a, b) {
            return a * b;
        }
    document.write(calculate(15, 15));
    var i = 30;
    while (i > 0) {
        document.write("-" + i);
        i--;
    }
    for (i=1; i<=9; i++) {
        document.write(i+"*"+i+"="+i*i+"&nbsp;&nbsp;");
    }

</script>

<input type="submit" name="Submit" value="Click Here" onClick="javascript:alert(‘You click this button.‘)">