//重要 js 运行
$(function (){ 代码 });

//第一种
输入框 <input type="text" data-upload="Descript" value="" />
$(function () {$('#btn').click(function () {var data = main.getData();main.ajaxAlertUniversal('/jbWuLiu/jbWuLiu/ToAreaEd', data);})})//第二种
function sub() {$('#btn').hide();var model = {Company: $('#Company').val(),BrandID: $('#BrandID').val(),BrandTitle: $('#BrandTitle').val(),ID: $('#ID').val()};$.ajax({url: '@Url.Action("AddrManageEd")',type: 'post',data: model,success: function(data) {if (data.code > 0) {alert('修改成功！');self.location = document.referrer;} else {alert(data.msg);}$('#btn').show();}});
}
//提交
<input id="btn" type="button" class="btn" value="保存" οnclick="sub();" />
//后台代码
return Json(new { code = 1, msg = "操作成功！" });

//第一种
$(function () {var txt1 = '为必填项';              // 以 HTML 创建新元素var txt2 = $("<b></b>").text("Text2.");  // 以 jQuery 创建新元素var txt3 = document.createElement("p");txt3.innerHTML = "Text.";$("#Company").blur(function (){if ($("#Company").val().trim() == "") {IsNull = true;$("b").append(txt1).css("color", "red");$(this).css("background-color", "#D6D6FF");}})
})//第二种
$(function () {$("input").each(function () {$(this).focus(function () { $(this).css("background-color", "#FFFFCC") });$(this).blur(function () { $(this).css("background-color", "#D6D6FF") });})$(".must").each(function () {$(this).blur(function () {if ($(this).val().trim() == "") {$(this).next().html('带*的为必填项').css("color", "red");} else {$(this).next().html("");}})})
})

//引用
<script src="~/js/main.js"></script>
<script src="~/Scripts/PCASClass.js"></script>
<script>$(function () {new PCAS("Adress1", "Adress2", "Adress3", '@(Model.FromAddr == "" ? "" : Model.FromAddr.Split(' ')[0])', '@(Model.FromAddr.Split(' ').Length >1 ? Model.FromAddr.Split(' ')[1] : "")', '@(Model.FromAddr.Split(' ').Length == 3 ? Model.FromAddr.Split(' ')[2] :"" )');})function sub() {var FromAddrr = '';$('#Adress>select').each(function (index) {FromAddrr += $(this).val() +' ';// if (index < $('#Adress>select').length - 1) FromAddrr += ' ';
        })$("#btn").hide();var model = {BrandID: $("#BrandID").val(),ID: $("#ID").val(),FromTitle: $("#FromTitle").val(),FromAddr: FromAddrr.trim(' ')};$.ajax({url: '@Url.Action("BrandAdressEd")',type: 'post',data: model,success: function(data) {if (data.code > 0) {alert('修改成功！');self.location = document.referrer;} else {alert(data.msg);}$("#btn").show();}});}
</script>//页面
<li class="fm_item"  id="Adress"><label>地址：</label><select name="Adress1" class="selectBox"></select><select name="Adress2" class="selectBox"></select><select name="Adress3" class="selectBox"></select>
</li>
<input id="btn" type="button" class="btn" value="保存" οnclick="sub();" />
//return json
return Json(new { code = 1, msg = "添加成功" });

$("#xxdxxd").val(this.value);
<input type="text" name="xxdxxd"  id="xxdxxd" />
val = $("#xxdxxd")[0].value;//例子
<script>function Show_xxdxxd(info) {//赋值操作var txt = info.value;$("#xxdxxd").val(txt);}function get_xxdxxd() {//取值操作val = $("#xxdxxd")[0].value;$("#get_info").html(val);}</script><div><input type="text" value="赋值文件框" id="verifyButton"  οnchange="Show_xxdxxd(this)" /><input type="text" name="xxdxxd"  id="xxdxxd" /><p>获取文件框值:<input type="button" value="读取文件框值" id="verifyButton" οnclick="get_xxdxxd()" /><div id="get_info"></div><p>
</div>//单选框
<div><input type="radio" name="_radio" value="1" ><input name="_radio" type="radio" value="2" ><input type="button" value="赋值文件框" οnclick="Show_redio()" /><input type="radio" name="radio_type" value="3"><input name="radio_type" type="radio" value="4" checked="checked"><input type="button" value="赋值文件框" οnclick="Show_redio()" />
</div><script>function Show_redio() {//获取单选项值 $("input[type=radio][checked]").val();//第一种方法, 取得选中状态的值_val = $("input[type=radio][checked]").val();//第二种方法,直接用radio的name进行操作, 取得选中状态的值  获取一组radio被选中项的值__val = $("input[name=radio_type][checked]").val();//radio单选组的第一个元素为当前选中值$("input[type=radio]").get(0).checked = true;$("input[name=radio_type]").get(0).checked = true;//alert(_val);//alert(__val);
    }</script>