启用`strictNullChecks`后，`void`类型和`undefined`文字类型有什么区别？(With `strictNullChecks` enabled, what is the difference between the `void` type and `undefined` literal type?)

 如果将excel表保存为csv文件，则可以使用PHP“fopen”和“fgetcsv”。 也可以使用xlsx文件 - 如果没有，另存为csv。 处理完PHP后，您可以使用带有json_encode的Javascript来填充数组中的值。 见例子： 
 
<?php  
        if (($handle = fopen("your file", "r")) !== FALSE) { 
            $i = 0;
            while (($lineArray = fgetcsv($handle, 10000, ";")) !== FALSE) { 
                for ($j=0; $j<count($lineArray); $j++) { 
                    $dataarray[$i][$j] = $lineArray[$j]; ");
                }
                $i++;
            } 
            fclose($handle); 
        }
?>

<script type="text/javascript">
    var data= <?php echo json_encode($dataarray); ?>;
</script>

You could use PHP "fopen" and "fgetcsv" if you save your excel sheet as a csv file. Could also work with a xlsx file - if not, save as csv. After processing the PHP you can use Javascript with json_encode to fill the values inside an array. See example:
 
<?php  
        if (($handle = fopen("your file", "r")) !== FALSE) { 
            $i = 0;
            while (($lineArray = fgetcsv($handle, 10000, ";")) !== FALSE) { 
                for ($j=0; $j<count($lineArray); $j++) { 
                    $dataarray[$i][$j] = $lineArray[$j]; ");
                }
                $i++;
            } 
            fclose($handle); 
        }
?>

<script type="text/javascript">
    var data= <?php echo json_encode($dataarray); ?>;
</script>