假如你的FORM名字是'formName',你的CHECKBOX名字是'chkName'var nCount = -1; if (document.formName.chkName) { nCount = 0; if (document.formName.chkName.length) { for (var i=0; i < document.formName.chkName.length; i++) { if (document.formName.chkName[i].checked) ++nCount; } } else { if (document.formName.chkName.checked) ++nCount; } }alert(nCount);//-1 if there is no checkbox named "chkName"
if (document.formName.chkName)
{
nCount = 0;
if (document.formName.chkName.length)
{
for (var i=0; i < document.formName.chkName.length; i++)
{
if (document.formName.chkName[i].checked)
++nCount;
}
}
else
{
if (document.formName.chkName.checked)
++nCount;
}
}alert(nCount);//-1 if there is no checkbox named "chkName"