openwrt 机器检测不是是重启成功的js

var tries = 0;function ok() {window.location = '<%=controller%>/admin';}function check() {if (tries++ < 12)window.setTimeout(ping, 5000);elsealert('<%:Device unreachable%>');}function ping() {var img = document.createElement('img');img.onload = ok;img.onerror = check;img.src = '<%=resource%>/icons/loading.gif?' + Math.random();document.getElementById('reboot-message').innerHTML = '<%:Waiting for device...%>';}

其中运用了是否加载图片成功否的判断语句。