1.输入框添加图标：

        {
            type: "input-group",
            size: "md",
            label: "",
            body: [
                {
                    type: "icon",
                    addOnclassName: "no-bg",
                    icon: "user",
                },
                {
                    type: "input-text",
                    placeholder: "username",
                    name: "jobName"
                }
            ]
        }

显示效果如图：
其中，icon:"user" 对应FontAwesome的"fa fa-user"

2.按钮上添加icon

                {
                    type: 'submit',
                    label: '登录2',
                    level: "primary",
                    icon: "fa fa-sign-in-alt"
                    // className: "btn",
                }

这里的icon里面定义直接用FontAwesome全名。效果如图：