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博客园 - jeky

rails 路由配置时 URL 地址如何匹配下划线? github.com 不能访问怎么办? Linux - 显示日历的命令 cal 用法 Linux - echo 命令如何追加文本? 如何解决ssh连接后长时间不操作断线的问题? Rails 中如何使用全局变量? raw 允许输出html字符 Linux 用户及组 话说调试 委托的协变与逆变 判断一个整数是奇数还是偶数 - jeky - 博客园 选择排序法 让我笔试吃亏"单例模式" 用Javascript实现关键词的高亮显示 Javascript中正则表达式的相识知识 对 TextBox 设置css属性 注意void()里面不能空 - jeky - 博客园 OWC11 实例 访问数组元素的 3 种方法 Internet Explorer 7.0(IE7.0)简体中文版
全等(===)
jeky · 2009-04-20 · via 博客园 - jeky

第一次发现全等(===)这个比较运算符:

===     全等(值和类型)

    

<script type="text/javascript">
var x = 5;
document.writeln(x 
== 5);    // true
document.writeln(x == '5');    // true
document.writeln(x === 5);    // true
document.writeln(x === '5');    // false
document.writeln(x != '5'); // false
document.writeln(x !== '5');    // true
</script>