/*
DOM相关
*/
/**
* [showDomOutline description] 显示全部DOM边框
* @return {null}
*/
function showDomOutline(arr) {
[].forEach.call($$("*"), dom => {
dom.style.outline = "1px solid #" + (~~(Math.random() * (1 << 24))).toString(16);
});
}