jquery 中的val()，可以取值也可赋值，表单元素中的radio和checkbox是比较常用的控件，下面说说对它们的取值和赋值的使用
1、取值
表单如下：
<div class="items">
@if (Model.Question.type == "单选")
{
<div><input type="radio" id="A" name="sin" value="A" /><label for="A"><span class="item">A</span>@Model.Question.A</label></div>
<div><input type="radio" id="B" name="sin" value="B" /><label for="B"><span class="item">B</span>@Model.Question.B</label></div>
<div><input type="radio" id="C" name="sin" value="C" /><label for="C"><span class="item">C</span>@Model.Question.C</label></div>
<div><input type="radio" id="D" name="sin" value="D" /><label for="D"><span class="item">D</span>@Model.Question.D</label></div>
}
else if (Model.Question.type == "多选")
{
<div><input type="checkbox" id="A" name="mul" value="A" /><label for="A"><span class="item">A</span>@Model.Question.A</label></div>
<div><input type="checkbox" id="B" name="mul" value="B" /><label for="B"><span class="item">B</span>@Model.Question.B</label></div>
<div><input type="checkbox" id="C" name="mul" value="C" /><label for="C"><span class="item">C</span>@Model.Question.C</label></div>
<div><input type="checkbox" id="D" name="mul" value="D" /><label for="D"><span class="item">D</span>@Model.Question.D</label></div>
}
else
{
<div><input type="radio" id="A" name="jul" value="@Model.Question.A" /><label for="A"><span class="item"></span>@Model.Question.A</label></div>
<div><input type="radio" id="B" name="jul" value="@Model.Question.B" /><label for="B"><span class="item"></span>@Model.Question.B</label></div>
}
</div>
jquery代码：
$(".items input").click(function () {
var answer = "";
if (type == "单选") {
answer = $(":radio[name=sin]:checked").val();
alert(answer);
} else if (type == "多选") {
$(":checkbox[name=mul]:checked").each(function () {
answer += $(this).val() + ",";
});
} else {
answer = $("input:radio[name=jul]:checked").val();
}
$.post("/home/clickItem", { questionId: '@Model.Question.id', userAnswer: answer }, function (data) {
if (data != "ok") {
alert(data);
location.href = "/home/login";
}
});
});
radio 好取，只要取 :checked 选中的值，checkbox 可能是多选，需要循环取值
2、赋值
赋值可不能这样 $(":radio").val("B")，这种是不行的，使用数组的方式赋值，应该这样 $(":radio").val(["B"]) ,$(":checkbox").val(["A","C","D"]),
if (type == "单选") {
$(":radio[name=sin]").val([useranswer]);
} else if (type == "多选") {
var arr = useranswer.substring(, useranswer.length - ).split(","); //useranswer="B,C,D"这种形式转成数组
$(":checkbox[name=mul]").val(arr);
} else {
answer = $(":radio[name=jul]").val([useranswer]);
}