how can I set HTML body's first table's first'row first's td's height using Jquery?

how can I set HTML body's first ta开发者_如何转开发ble's first'row first's td's height using Jquery?

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$('body table:first tr:first td:first').height(500);

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Depending on the meaning of your question..

To get the first td on the page (which will be the first td of the first tr of the first table).

$("td:first").css("height", "65");

but if you want to set the height of all the td's of the first tr

$("tr:first td").each(function(index)
     $(this).css("height", "65");
});

But modifying the height of one cell will mean all the other cells are of that set height anyway.

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Here is the code:

$("table:first tr:eq(0) td:first-child").css("height","300");

But there is one more thing: if you modify a cell height, all the others from the same row will follow.

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$($($($('body').first('table')).first('tr')).first('td')).height(500);