当前背景图显示效果是平铺的,怎么改才能让背景图铺满整个页面 ,本人对代码一窍不通,高手帮忙看下。
var canvas = document.createElement( 'canvas' );
canvas.width = 32;
canvas.height = window.innerHeight;
var context = canvas.getContext( '2d' );
var gradient = context.createLinearGradient( 0, 0, 0, canvas.height );
gradient.addColorStop(0, "#1e4877");
gradient.addColorStop(0.5, "#4584b4");
context.fillStyle = gradient;
context.fillRect(0, 0, canvas.width, canvas.height);
document.body.style.background = 'url(./f.jpg)' ;
就是怎么把下面第一张图的效果改成第二张图那样的效果