src/Leevel/View/Parser.php
protected function compileThemeTree(): string
    {
        $cache = '';

        foreach ($this->themeTree as $theme) {
            $this->compileTheme($theme);
            $cache .= $theme['content'];
        }

        return $cache;
    }
protected function compileThemeTree(): string
    {
        $cache = '';

        foreach ($this->themeTree as $theme) {
            $this->compileTheme($theme);
            $cache .= $theme['content'];
        }

        return $cache;
    }
逐个编译模板树.

@return string