排名練習：向表格添加資料，當編號遇到重複給予提示並且無法添加，而且按排名順序添加資料
參考代碼：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><title>ggggg</title><link rel="stylesheet" type="text/css" href=""><meta http-equiv="content-type" content="text/html;charset=utf-8"><!--js代碼可以放置在任意位置，按照先後順序依次執行 一般放在head標籤之間--><script type="text/javascript"> function test(){ //獲得表格對象 var mytable=document.getElementById("table1"); //判斷插入是否重複的排名 //遍曆 //定義變數要插入的位置 var insertW=mytable.rows.length; for(var i=1;i<mytable.rows.length;i++){ //取出每一行 var eRows=mytable.rows[i]; //判斷輸入的排名是否重複 if(eRows.cells[0].innerText==no.value){ window.alert("與排名 "+eRows.cells[0].innerText+" 重複"); return ;//阻止代碼往下面執行 } //進行排序 尋找要插入的位置 if(parseInt(no.value)>parseInt(eRows.cells[0].innerText)){ insertW=i; //window.alert(insertW); } //window.alert("ok"); } //排序後的插入 var eachRow=mytable.insertRow(insertW+1); //每行添加資料 eachRow.insertCell(0).innerText=document.getElementById("no").value; eachRow.insertCell(1).innerText=username.value; eachRow.insertCell(2).innerText=nickname.value; }</script></head><body> <table id="table1" border="1"> <tr><td>排名</td><td>姓名</td><td>外號</td></tr> <tr><td>1</td><td>宋江</td><td>及時雨</td></tr> <tr><td>2</td><td>盧俊義</td><td>玉麒麟</td></tr> <tr><td>10</td><td>test</td><td>test</td></tr> </table> <br/><br/> 排名:<input id="no" type="text" name="no"><br/> 姓名:<input id="username" type="text" name="username"><br/> 外號:<input id="nickname" type="text" name="nickname"><br/> <input type="button" value="添加" onclick="test()"><br/></body></html>
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