Add docs

docs/form/examples/form.validate.md

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+<div class="layui-form">  
+  <div class="layui-form-item">
+    <label class="layui-form-label">手机</label>
+    <div class="layui-input-block">
+      <input type="tel" name="phone" lay-verify="required|phone" class="layui-input" id="validate-phone">
+    </div>
+  </div>
+  <div class="layui-form-item">
+    <label class="layui-form-label">验证码</label>
+    <div class="layui-input-inline">
+      <input type="text" name="vercode" lay-verify="required" class="layui-input">
+    </div>
+    <div class="layui-inline"> 
+      <button type="button" class="layui-btn layui-btn-primary" id="validate-get-vercode">获取验证码</button>
+    </div>
+  </div>
+  <div class="layui-form-item">
+    <div class="layui-input-block">
+      <button class="layui-btn" lay-submit lay-filter="demo-validate">提交</button>
+    </div>
+  </div>
+</div>
+ 
+<script>
+layui.use(function(){
+  var $ = layui.$;
+  var form = layui.form;
+  var layer = layui.layer;
+  
+  // 点击获取验证码
+  $('#validate-get-vercode').on('click', function(){
+    var isValid = form.validate('#validate-phone');  // 主动触发验证，v2.7.0 新增 
+    // 验证通过
+    if(isValid){
+      layer.msg('手机号规则验证通过');
+      // 此处可继续书写「发送验证码」等后续逻辑
+      // …
+    }
+  });
+
+  // 提交事件
+  form.on('submit(demo-validate)', function(data){
+    var field = data.field; // 获取表单字段值
+
+    // 显示填写结果，仅作演示用
+    layer.alert(JSON.stringify(field), {
+      title: '当前填写的字段值'
+    });
+
+    // 此处可执行 Ajax 等操作
+    // …
+
+    return false; // 阻止默认 form 跳转
+  });
+});
+</script>