摘要： set package_loading_result(img::jpeg) [catch {package require img::jpeg 1.3}]set package_loading_result(img::gif) [catch {package require img::gif 1.3}]set package_loading_result(img::png) [catch {package require img::png 1.3}]# Check for package loading successset l_failures 0foreach i_package [arr 阅读全文