统计当前页面有多少个标签

统计当前页面含有多少个标签ES6const domNames = Array.form(document.querySelectorAll(’’)).map(v => v.tagName);const result = new Set(domNames);console.log(当前页面存在的标签个数为： ${result.size});JSconst dom = document.querySelectorAll(’’);const domNames = [];Array.from(dom).forEach(v => { domNames.push(v.tagName);});const obj = {};const newArr = [];domNames.forEach(name => { if(!obj[name]) { newArr.push(name); obj[name] = true; }});console.log(newArr.length);原生JS统计页面所有标签的种类var all = document.querySelectorAll(’*’); var tags = []; all.forEach(item => { tags.push(item.tagName.toLocaleLowerCase()); }); // 存储标签的种类以及相应的个数 var result = {}; for(var i = 0; i < tags.length; i++) { if(!result[tags[i]]) { result[tags[i]] = 1; } else { result[tags[i]]++; } } console.log(res); console.log(Reflect.ownKeys(res).length);