小编use*_*230的帖子

我试图在JavaScript中将HTML5画布转换为PDF,但我得到一个黑色背景PDF.我试图改变背景颜色,但仍然变黑.以下是我正在尝试的代码:

Canvas = document.getElementById("chart");
Context = Canvas.getContext("2d");

var imgData = Canvas.toDataURL('image/jpeg');
var pdf = new jsPDF('landscape');
pdf.addImage(imgData, 'JPEG', 0, 0, 1350, 750);
pdf.save('download.pdf');

如果您有任何想法,我会非常感激.

我正在尝试比较两个对象数组，例如

list1 = [{id:1,name:'amy'},{id:3,name:'zoe'}];  
list2 = [{id:1,name:'sally'},{id:3,name:'zoe'}];    

select *
from list1 a, list2 b
where a.id = b.id
and a.name = b.name

Result: id:3, name:'zoe'

我怎样才能用 Javascript 写这个？