MutationObserver 监听元素变化

const callback = function(mutationsList, observer) {    for(const mutation of mutationsList) {        if (mutation.type === 'childList') {            for(const node of mutation.addedNodes) {                if(node && node.tagName === 'SCRIPT') {                    if(node.className.indexOf('cate-prefer2') > -1) {                        node.setAttribute('type', 'text/html');                    }                }            }        }    }};

background-image: linear-gradient(    to top right,    transparent 0%,    transparent calc(50% - 1px),    #ccc 50%,    transparent calc(50% + 1px),    transparent 100%);