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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title></head><body><p class="test test1">class -> test test1</p><p class="test test1 test2">class -> test test1 test2</p><p class="test test2">class -> test test2</p><script>function classSelectors(className, tagName) {// return [...document.getElementsByTagName(tagName || '*')].filter(function (value) {// return className.split(' ').every(function (elem) {// return value.className.split(' ').includes(elem)// })// });return [...document.getElementsByTagName(tagName || '*')].filter(value => className.split(' ').every(elem => value.className.split(' ').includes(elem)));}// 获取首个添加背景和字体颜色测试classSelectors('test test2', 'p').shift().style.cssText = 'background:yellow;color:red';console.log(classSelectors('test test2', 'p'));</script></body></html>
