jQuery发送图片验证码请求

var preimageCodeId = ""
function generateImageCode() {

    //生成随机字符串
    imageCodeId = generateUUID()

    //拼接url路径,携带随机字符串参数
    image_url = "/passport/image_code?cur_id=" + imageCodeId + "&pre_id=" + preimageCodeId

    //设置到图片标签中
    $(".get_pic_code").attr("src",image_url)

    //记录上一次的随机字符串
    preimageCodeId = imageCodeId
}