p5.js loop()用法及代码示例

let l = 0; 
  
function setup() { 
    
  // Create canvas of given size 
  createCanvas(500, 300); 
    
  // Set the background color 
  background('green'); 
  
} 
  
function draw() { 
    
  // Set the stroke color 
  stroke('white'); 
    
  l = l + 0.5; 
  if (l > width) { 
    l = 0; 
  } 
    
  // Function to draw the line 
  line(l, 0, l, height); 
    
} 
  
function mousePressed() { 
  noLoop(); 
} 
  
function mouseReleased() { 
  loop(); 
}