整数リテラル

1234
+1234
-1234
0

<script type="text/javascript">
var sampleA = 1234;
document . write( "変数「sampleA」の値は、「" + sampleA + "」<br />" );
document . write( "変数「sampleA」のデータ型は、「" + typeof( sampleA ) + "」<br />" );
var sampleB = +1234;
document . write( "変数「sampleB」の値は、「" + sampleB + "」<br />" );
document . write( "変数「sampleB」のデータ型は、「" + typeof( sampleB ) + "」<br />" );
var sampleC = -1234;
document . write( "変数「sampleC」の値は、「" + sampleC + "」<br />" );
document . write( "変数「sampleC」のデータ型は、「" + typeof( sampleC ) + "」<br />" );
var sampleD = 0;
document . write( "変数「sampleD」の値は、「" + sampleD + "」<br />" );
document . write( "変数「sampleD」のデータ型は、「" + typeof( sampleD ) + "」<br />" );
</script>