<html> <head> <title>test</title> <script type="text/javascript"> function f() { var sel=document.getElementById("country"); var sel2=document.getElementById("city"); var cnarr1=new Array("bj","sh") var cnarr2=new Array("beijing","shanghai") var usaarr1=new Array("dc","ny") var usaarr2=new Array("Washington","NewYork") for(var i=sel2.length;i>=0;i--){ sel2.removeChild(sel2.childNodes[i]); } var op=document.createElement("option"); op.value="please"; op.text="please"; sel2.appendChild(op); if(sel.value=='USA'){ for(i=0;i<2;i++){ op.value=usaarr1[i]; op.text=usaarr2[i]; sel2.appendChild(op); } } else if(sel.value=='CN'){ for(i=0;i<2;i++){ op.value=cnarr1[i]; op.text=cnarr2[i]; sel2.appendChild(op); } } } </script> </head> <body> <select onchange="f()"> <option >please</option> <option value='USA'>America</option> <option value='CN'>China</option> </select> <select> <option >please</option> </select> </body> </html>
JavaScript实现级联菜单的方法
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