"<table align='center' width='1000' border=0 cellspacing=0 cellpadding=0 height='1000'><tr> <td bgcolor='linear-gradient(red , blue)' width='100%'></td></tr> </table>"
"<table align='center' width='1000' border=0 cellspacing=0 cellpadding=0 height='1000'><tr> <td style='background: linear-gradient(to left,red, blue)' width='100%'></td></tr> </table>"
要用background-image，而且写在style里面
<td style='background-image:linear-gradient(red , blue)' width='100%'>
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