验证码

验证码：

views.py：

# 随机生成rgb数字的函数
from PIL import Image, ImageDraw, ImageFont
from io import BytesIO ## 图片保存（写到内存中）
import random

def get_rgb():
    return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))


def get_valid(request):

     # img = Image.new('RGB', (450, 30), get_rgb())
 # 生成一张图片(Image模块下的new函数，返回一个Image对象)数字是宽，高
　　
    img = Image.new('RGB', (450, 30), (255, 255, 255))
    
    img_draw = ImageDraw.Draw(img) 
 # 把图片放到画板上
    img_font = ImageFont.truetype('./static/font/ss.TTF', 25)
    # 随机生成5个大写字母,小写字母,数字，文件需要是ttf格式，25是大小
    valid_code = ''
    for i in range(5):
        low_char = chr(random.randint(97, 122))
        num_char = random.randint(0, 9)
        upper_char = chr(random.randint(65, 90))
        res = random.choice([low_char, num_char, upper_char])
        valid_code += str(res)
        img_draw.text((i * 63 + 50, 0), str(res), get_rgb(), img_font)
    print(valid_code)
    # 把验证码存到session中
    request.session['valid_code'] = valid_code
    # 画线和点圈
    width = 450
    height = 30
    for i in range(10):
        x1 = random.randint(0, width)
        x2 = random.randint(0, width)
        y1 = random.randint(0, height)
        y2 = random.randint(0, height)
        # 在图片上画线
        img_draw.line((x1, y1, x2, y2), fill=get_rgb())

    for i in range(50):
        # 画点
        img_draw.point([random.randint(0, width), random.randint(0, height)], fill=get_rgb())
        x = random.randint(0, width)
        y = random.randint(0, height)
        # 画弧形
        img_draw.arc((x, y, x + 4, y + 4), 0, 90, fill=get_rgb())

    f = BytesIO()
    img.save(f, 'png')
    data = f.getvalue()
    return HttpResponse(data)

随机验证码点击更换：

html：

<script>
    $("#id_valid_code").click(function () {
        var url = $("#id_valid_code")[0].src
        $("#id_valid_code")[0].src = url + '?'
    })

    $("#id_submit").click(function () {
        //不建议在js中写模板语法
        $.ajax({
            url: '/login/',
            method: 'post',
            data: {
                'username': $('[name="username"]').val(),
                'password': $('[name="password"]').val(),
                'valid_code': $('[name="valid_code"]').val(),
                'csrfmiddlewaretoken': $('[name="csrfmiddlewaretoken"]').val()
            },
            success:function (data) {
                if(data.code==100){
                    location.href=data.url
                }else {
                    $('.error').html(data.msg)
                }

            }
        })

    })


</script>

# 生成一张图片(Image模块下的new函数，返回一个Image对象)