Question

我正在尝试使用A-Frame添加Javascript个元素，但不会工作。我需要一个for循环来添加一堆盒子。

//Starting variables
var sceneEl = document.getElementsByTagName('a-scene')[0];
var pathLength = 8;

// path
for (var i = -1; i => -pathLength; i--) {
  //wood
  var woodPathEl = document.createElement('a-box');
  woodPathEl.setAttribute("position", "0 -1 " + i);
  woodPathEl.setAttribute("src", "#wood");
  sceneEl.appendChild(woodPathEl);

  //  grass
  var grassPathEl = document.createElement('a-box');
  grassPathEl.setAttribute("position", '-1 -1 ' + i);
  grassPathEl.setAtrribute("src", '#grass');
  sceneEl.appendChild(grassPathEl);
}

Answer 1

虽然循环方法对我来说似乎有些不同寻常，但我认为真正的问题在于package com.test; import java.io.RandomAccessFile; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; public class MappedFileGarbage { public static void main(String[] args) throws Exception { RandomAccessFile raf = new RandomAccessFile("blah.bin", "rw"); MappedByteBuffer mbf = raf.getChannel().map(FileChannel.MapMode.READ_WRITE,0,100*8L); mbf.putInt(1000).putInt(2000).putDouble(4000.0); raf.close(); raf = new RandomAccessFile("blah.bin", "rw"); mbf = raf.getChannel().map(FileChannel.MapMode.READ_WRITE,0,100*8L); dump(mbf); } private static void dump(MappedByteBuffer mbf){ // Reading the data without manually setting the position, as getXXX(n) methods internally increment the position. System.out.println(mbf.getInt(0)); System.out.println(mbf.getInt(4)); System.out.println(mbf.getDouble(8)); // Reading the data via getXXX() method as manually setting the position, as getXXX(n) methods don't increment the position. System.out.println(mbf.position()); System.out.println(mbf.getInt()); System.out.println(mbf.position(4)); System.out.println(mbf.getInt()); System.out.println(mbf.position(8)); System.out.println(mbf.getDouble()); System.out.println(mbf.position()); } }。您希望将=>用于“大于或等于”。 >=用于ES6中的箭头功能分配，这是一种完全不同的动物。

如何在Javascript中添加A帧元素？

1 个答案: