ie8浏览器中的画布不起作用

Question

Html5 画布在 ie8 浏览器中不起作用... 大家能告诉我怎么解决吗... 在下面提供我的代码

 var animate = function() {
        ctx.width = ctx.width;

        percent += STEP_PERCENT;
        var deg = percent / 100 * deg360;

        drawArc('#aaa', radius, deg360);
        drawArc('#0e728e', radius, deg);
        for (var i = 0, n = Math.floor(deg / deg60); i < n; i++) {
            var from = i * deg30 + deg2;
            var to = from + deg30 - deg2 * 2
            drawArc('#250696', radius, to, from);
        }
        drawArc('#fff', radius - SPINNER_WIDTH, deg360);

        if (percent >= 100) {
            document.getElementById('text').innerText = 'FINISHED';
        } else {
            setTimeout(animate, STEP_DELAY);
        }
    }

Answer 1

IE8 不支持 Canvas，有一种解决方法叫做 excanvas https://code.google.com/p/explorercanvas/

效果不错，但有些东西还是不支持