打开链接后填写表格的问题

Question

我正在学习JavaScript，因此决定创建一个脚本来

1. 打开页面
2. 填写页面上的表格
3. 点击提交按钮
4. 将打开一个新页面
5. 从此页面获取数据并登录到控制台。

但是在页面从第1行打开之后，脚本的其余部分没有运行。

我如何完成此任务？

    loginPage=open("abc.com"); //Open this page to fill a form there
    var mainPage;
    loginPage.onload=function(){ //once the page gets loaded fire this function
            document.getElementById("username").value="123456789"; //fill username with this value
            document.getElementById("password").value="abcdefghijk"; //fill password with this value
            mainPage=document.getElementsByClassName("loginbutton")[0].click(); //press the login button
        }
    mainPage.onload=function(){
            x=document.getElementsByClassName("tabletext");  //grab the table
            target=x[22]; //since the content is in the 22nd index, assign it to target
            console.log(target.textContent); //log the value of text inside target to console.
    }

Answer 1

Is "abc.com" the same domain as the site that you're executing this script on? If it's not, it's simply not possible due to the fact that you're violating CORS / browser security measures. You cannot read the content from another domain using JS that doesn't explicitly allow all origins.