后端
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019-08-29 15:06
# @Author  : Xinru
from flask import Flask,render_template,url_for
app = Flask(__name__)
@app.route('/')
def index():
    return render_template('index.html')
    # return url_for('static', _external=True, filename='img/ww.png')
@app.route('/uu/')
def uu():
    context = {
        'imgurl':'/static/img/img1.jpg',
        'age':2
    }
    # return render_template('uu.html',imgurl='/static/img/ww.png')
    return render_template('uu.html', **context)
if __name__ == '__main__':
    app.run(debug=True)
网页插入图片
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>pthoto测试</title>
</head>
<body>
        <p>方法一</p>
        <img src="/static/img/ww.png">
        <p>方法二</p>
        <img src = "{{ url_for('static', filename = 'img/ww.png') }}">
</body>
</html>
传参给前端
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>photo</title>
</head>
<body>
    <p>方法一</p>
    {{ imgurl }}
    <p></p>
    <img src="{{ imgurl }}">
</body>
</html>