使用js实现checkbox的全选与反选功能二

来源：互联网发布：淘宝主图如何吸引人编辑：程序博客网时间：2024/06/15 21:33

效果图如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>New Web Project</title><script type="text/javascript">/** * 全选 */function selectAll() {var all = document.getElementById("all");var languages = document.getElementsByName("language");for (var i=0; i < languages.length; i++) {languages[i].checked = all.checked;}}/** * 当下面所有的选项都被选中时，全选被选中 * 当下面所有的选项有一个没有被选中时，全选不被选中 */function sel() {var all = document.getElementById("all");var languages = document.getElementsByName("language");var count = 0;for (var i=0; i < languages.length; i++) {if(languages[i].checked) {count++;}}if(count == languages.length) {all.checked = true;}else {all.checked = false;}}</script></head><body><input type="checkbox" id="all" onclick="selectAll()" />全选<br/>编程语言：<br/><input type="checkbox" name="language" value="C" onclick="sel()" />C<br/><input type="checkbox" name="language" value="C++" onclick="sel()" />C++<br/><input type="checkbox" name="language" value="Java" onclick="sel()" />Java<br/><input type="checkbox" name="language" value="Python" onclick="sel()" />Python<br/></body></html>

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