JavaScript 判断复选框是否选中并取出值

<title>JavaScript 获取复选框的值</title>

<script>

function checkbox()

{

var str=document.getElementsByName("box");

var objarray=str.length;

var chestr="";

for (i=0;i<objarray;i++)

{

if(str[i].checked == true)

{

chestr+=str[i].value+",";

}

}

if(chestr == "")

{

alert("请先选择复选框～！");

}

else

{

alert("复选框的值是："+chestr);

}

}

</script>

选择您的拿手技术：

<input type="checkbox" name="box" id="box1" value="ASP" />ASP

<input type="checkbox" name="box" id="box2" value="PHP" />PHP

<input type="checkbox" name="box" id="box3" value="JSP" />JSP

<input type="button" name="button" id="button" onclick="checkbox()" value="提交" />