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python代码：
from flask import render_template
from app import app
@app.route('/')
@app.route('/index')
def index():
    user = {'nickname': 'Miguel'}  # fake user
    posts = [  # fake array of posts
        {
            'author': {'nickname': 'John'},
            'body': 'Beautiful day in Portland!'
        },
        {
            'author': {'nickname': 'Susan'},
            'body': 'The Avengers movie was so cool!'
        }
    ]
    return render_template("index.html",titlt="home",posts=posts,user=user)

前端javascript代码：
<script language="JavaScript">    $(document).ready(function () {        var s='{{ posts|tojson|safe}}';        alert(s);    });</script>

在接收java传递的值时，使用

var s='${posts}';


即可，注意是单引号，双引号可能取不到值。