AND 和 OR 运算符实现，如：SELECT * FROM table WHERE keyword1 AND keyword2 OR keyword3;。AND 和 OR 运算符实现，如：SELECT * FROM table WHERE keyword1 AND keyword2 OR keyword3;。if 语句或 switch 语句来根据不同的条件执行相应的代码。document.getElementById()或document.querySelector()方法来查询元素的值。，，``javascript，var value = document.getElementById("elementId").value;，``Powered By Z-BlogPHP 1.7.3
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