canvas调用scale或者drawImage图片操作后，锯齿感很明显的解决

来源：互联网发布：端口号重复编辑：程序博客网时间：2024/04/30 17:33

<script type="text/javascript">    //解决canvas画画图片    var mengvalue = -1;        var phoneWidth = parseInt(window.screen.width);    var phoneScale = phoneWidth / 640;    var ua = navigator.userAgent;    if (/Android (\d+\.\d+)/.test(ua)) {        var version = parseFloat(RegExp.$1);        // andriod 2.3        if (version > 2.3) {            document.write('<meta name="viewport" content="width=640, minimum-scale = ' + phoneScale + ', maximum-scale = ' + phoneScale + ', target-densitydpi=device-dpi">');            // andriod 2.3以上        } else {            document.write('<meta name="viewport" content="width=640, target-densitydpi=device-dpi">');        }        // 其他系统    } else {        document.write('<meta name="viewport" content="width=640, user-scalable=no, target-densitydpi=device-dpi">');    }    </script>

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