在HTML代码中执行JavaScript文件_Javascript_Jquery_Html

在HTML代码中执行JavaScript文件

javascript jquery html

在HTML代码中执行JavaScript文件,javascript,jquery,html,Javascript,Jquery,Html,我需要在HTML代码中添加一个JavaScript文件，并需要在HTML页面中获得添加的JavaScript文件的输出。请帮帮我，我卡住了，这是我的HTML代码： <!DOCTYPE html> <html> <body> <script src="tst.js"> </script> </body> </html> var mysql = require('my

我需要在HTML代码中添加一个JavaScript文件，并需要在HTML页面中获得添加的JavaScript文件的输出。请帮帮我，我卡住了，这是我的HTML代码：

<!DOCTYPE html>
<html>
    <body>
        <script src="tst.js">
        </script>
    </body>
</html>

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();

我在添加脚本文件的HTML页面上没有得到任何输出。你们能帮助我吗？

运行代码时，控制台出现错误：

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();

未捕获引用错误：未定义require

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();

我已将js文件更改为仅包含警报（“测试”）；它运行良好

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();

我相信这是您使用的require方法，它不是Node.js的JavaScript

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();

编辑：经过一点研究后，似乎有多个第三方require函数，因此应该是找到您后面的函数并包括该库的情况

检查控制台是否有错误。我在控制台中获得了无错误输出，输出为json格式。您能建议我如何将这些输出检索到html吗page@samirjs代码不需要在[self executing]函数中运行，只需要在更新DOM时处于doc就绪状态。您正在编译js吗？如果没有，您可能无法使用

require

。请在返回时阅读上面的链接

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'host',
    user : 'user',
    password : 'pass',
    database : 'db',
    insecureAuth : 'true'
});
connection.connect();
var json = '';
connection.query('SELECT * FROM SmartAG AS readings ORDER BY Timestamp DESC', function(err, rows, fields) {
    if (err) throw err;
    console.log('The solution is: ');
    console.log(rows[0]); // results are coming here.
    json = JSON.stringify(rows[0]);
    console.log(json);
    //output.innerHTML = JSON.stringify(json)
});

connection.end();