已解决，JS with jQuery width（），removeAttr（）以避免wordpress内联宽度和高度。还有负利润。

 var anchoArticulo = $(\'article.single-post\').width();
    $(\'article.single-post div.single-post img.ancho_completo\')
    .removeAttr(\'width height\')
    .css(\'margin-left\' , -(winWidth - anchoArticulo)/2)
    .css(\'width\' , winWidth);