<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title> js下拉联动</title> <script> function setsecond(obj){ var val = obj.value; if(val == 'en'){ var sec = document.getelementbyid('second'); sec.innerhtml = <option>one</option><option>two</option>; }else{ var sec = document.getelementbyid('second'); sec.innerhtml = <option>一</option><option>二</option>; } } </script> </head> <body> <p> <select id="first" onchange="setsecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </p> <p> <select id="second"> </select> </p> </body> </html>
使用innerhtml，ie浏览器不支持这种方法的，所以改进方法：
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>js下拉联动</title> <script> function setsecond(obj){ var val = obj.value; if(val == 'en'){ var sec = document.getelementbyid('second'); sec.options[0] = new option(one,one); sec.options[1] = new option(two,two); }else{ var sec = document.getelementbyid('second'); sec.options[0] = new option(一,one); sec.options[1] = new option(二,two);//可设置循环配置，也可一个一个配置 } } </script> </head> <body> <p> <select id="first" onchange="setsecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </p> <p> <select id="second"> </select> </p> </body> </html>
可以兼容火狐，ie等
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以上就是js实现下拉框联动步骤详解的详细内容。