行数制限 | 処理がめちゃくちゃ重いので使わないほうがいい

restrict_row.js

restrictRow('.restrict-row', 3, '...');
function restrictRow(elm, row, postfix_arg) {
	var target   = {
				$elm : $(elm),
				html : $(elm).html()
			},
			clone    = {
				$elm   : target.$elm.clone(),
				height : 0
			},
			postfix  = postfix_arg || '...',
			tmp      = '';

	clone.$elm.css({
		opacity  : '0',
		position : 'absolute',
		overflow : 'visible'}
	).width(target.$elm.width()).height('auto');
	target.$elm.after(clone.$elm);

	for (var i=0; i<row; i++) tmp += "ぬ<br>";
	clone.$elm.html(tmp);
	clone.height = clone.$elm.height();
	clone.$elm.remove();

	while((target.html.length > 0) && (target.$elm.height() > clone.height)) {
		target.html = target.html.substr(0, target.html.length - 1);
		target.$elm.html(target.html + postfix);
	}
}