使用jQuery Validation插件验证不在表单内的输入

$("#myInput").validate({
    rules: {
        myInput: {
            required: true,
            minlength: 5
        }
    },
    messages: {
        myInput: {
            required: "请输入内容",
            minlength: "输入内容长度不能小于5"
        }
    }
});

$("body").on("blur", "#myInput", function() {
    $(this).validate({
        rules: {
            myInput: {
                required: true,
                minlength: 5
            }
        },
        messages: {
            myInput: {
                required: "请输入内容",
                minlength: "输入内容长度不能小于5"
            }
        }
    });
});