[請益] Javascript 迴圈找ID
網頁裡面的欄位有6個ID分別為:tb1,tb2,tb3,tb4,tb5,sum
想要回圈的方式把5個tb值加起來...再用sum顯示
請問我在javascript 裡面跑回圈
var sum =0;
for(i=1;i<6;i++)
{
sum=sum+getElementById("tb".i).value;
}
document.getElementById("sum").value=sum;
卻沒有結果,請問是哪裡錯了嗎??
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