将烧瓶中的数据传递到javascript时，JSON中出现意外令牌{
[英]Unexpected token { in JSON while passing data from flask to javascript
问题描述
I am trying to pass simple data from flask to javascript file I am following this answer Passing a JSON object from Flask to JavaScript 
我正在尝试将简单的数据从Flask传递到javascript文件，我正在按照此答案将JSON对象从Flask传递到JavaScript
But i got Uncaught SyntaxError: Unexpected token { in JSON at position 1 at JSON.parse () 但是我遇到了Uncaught SyntaxError：意外的令牌{在JSON.parse（）位置1的JSON中
var user = JSON.parse('{{ data | tojson}}');
var grade=user.grade;
console.log(grade);
my python file have code 我的python文件有代码
@app.route("/quiz/0")
def quizFirst():
data={"grade":"0"}
return render_template('quiz.html',data=data)
the token { is not recognizable by javascript in js file, Any idea what i am missing. 令牌{无法被js文件中的javascript识别，任何想法我都缺少。
1 个解决方案
解决方案1
3 已采纳 2018-03-12 17:59:24
It works for me. 这个对我有用。 This JavaScript needs to be inside quiz.html . 该JavaScript必须位于quiz.html 。 The reason is that Flask will process quiz.html and replace {{ data | tojson }} 原因是Flask将处理quiz.html并替换{{ data | tojson }} {{ data | tojson }} with the data provided in render_template . {{ data | tojson }}以及render_template提供的数据。 However, it won't process your static JS file. 但是，它不会处理您的静态JS文件。
quiz.html: quiz.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>sotest</title>
</head>
<body>
Hello World!
<script>
var user = JSON.parse('{{ data | tojson}}');
var grade=user.grade;
console.log(grade);
</script>
</body>
</html>
app.py app.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from flask import Flask, render_template
app = Flask(__name__)
@app.route("/quiz/0")
def quizFirst():
data={"grade":"0"}
return render_template('quiz.html',data=data)
if __name__ == "__main__":
app.run(debug=True)
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