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++i 和i++区别
代码 <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, ini...
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JavaScript验证value值是否是数字
方法1：使用js自带的全局函数isNaN() function btn(){ var a=document.getElementById('num1').value; if(isNaN(a)==true) { alert('不是数字'); } } 方法2：使用正则表达式 /**...
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JavaSrcipt的引入四种方式
1.外链式 <script type="text/javascript" src="js/main.js"></script> 2.协议方式 <a href="javascript:alert('我是协议方式!')">点击</a> ...
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