相关疑难解决方法(0)

我已经知道怎么做了

- >调整图像大小:

var image = document.getElementById('myImage'),
    canvas = document.createElement('canvas'),
    ctx = canvas.getContext('2d');
ctx.drawImage(image,0,0,400,300);

- >或裁剪图像:

var image = document.getElementById('myImage'),
    canvas = document.createElement('canvas'),
    ctx = canvas.getContext('2d');
ctx.drawImage(image,50,50,image.width,image.height,0,0,50,50);

但我不知道如何调整大小然后裁剪图像.我怎么能这样做？谢谢.