在/wangruoban/modules/node/node.module\
大约 307行 可以看到 node_teaser函数
function node_teaser($body, $format = NULL, $size = NULL) {
if (!isset($size)) {
$size = variable_get('teaser_length', 600);
}
// Find where the delimiter is in the body
$delimiter = strpos($body, '<!--break-->');
// If the size is zero, and there is no delimiter, the entire body is the teaser.
if ($size == 0 && $delimiter === FALSE) {
return $body;
}
