Question

HTML：svg对象和脚本应该改变svg对象的颜色但是由于某种原因它没有？

<object id="object" type="image/svg+xml" data="play-pattern--light.svg"></object>

       <script type="text/javascript">
        window.onload=function () {

            var a = document.getElementById("object");
            var svgDoc = a.contentDocument;
            var styleElement = svgDoc.createElementNS("http://www.w3.org/2000/svg", "style");
            styleElement.textContent = ".st0 { fill: #000 }";
            svgDoc.getElementById("object").appendChild(styleElement);
        };

      </script>

我认为这就是为SVG对象着色所需的全部内容

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     width="160px" height="160px" viewBox="0 0 160 160" style="enable-background:new 0 0 160 160;" xml:space="preserve">
<style type="text/css">
    .st0{fill:#EDF5F5;}
</style>

需要一些指导，为什么我的代码不起作用，它也说错误＆＃34; Uncaught TypeError：无法读取属性＆quot; appendChild＆＃39; of null＆＃34;

由于

Answer 1

您应该使用：

public class SimpleTest extends TimerTask {

JFrame frame;
int count ,x1,y1,x2,y2;
public void run() {

  count+=5;
  x1=count;
  y1=count;
  x2=count-1;
  y2=count-1;
  // repaint();   i want to invoke paintcomponent method from here , simply to change the end point of line every secd
}
void guiMethod(){
     frame=new JFrame("Libra's");
    frame.setBounds(50, 50, 250, 250);
    frame.setVisible(true);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new NewPanel());
}
public static void main(String[] args){
SimpleTest c=new SimpleTest();
   c.guiMethod();

   Timer timer = new Timer();
   timer.schedule(new SimpleTest(), 1000,1000);
}
}
class NewPanel extends JPanel{
SimpleTest obj=new SimpleTest();
@Override
protected void paintComponent(Graphics g){

  Graphics2D g2=(Graphics2D)g;
  g2.setStroke(new BasicStroke(3));

  g.drawLine(120, 120, 70, 80);


  g.drawLine(120, 120, obj.x1, obj.y1);

  g.drawLine(120, 120, obj.x2, obj.y2);
}}

而不是

svgDoc.documentElement.appendChild(styleElement);

改变svg对象的颜色？

1 个答案: