问检查使用纯js /跨浏览器解决方案的元素中是否存在伪类(：after，：pure，.)

EN

    constructor() {
        this._options = {
            pseudoElements: ['active', 'checked', 'disabled', 'empty', 'enabled', 'first-child', 'first-of-type', 'focus', 'hover', 'in-range', 'invalid', 'last-child', 'last-of-type', 'link', 'not(*)', 'nth-child(*)', 'nth-last-child(*)', 'only-of-type', 'only-child', 'optional', 'out-of-range', 'read-only', 'read-write', 'required', 'root', 'target', 'valid', 'visited', 'after', 'before']
        }
    }

    _handleElmCss(domElm, newElm) {
        // could not think any better solution then getting all CSS without pseudo then checking with pseudo the same Style object difference. I need as fast as possible way, because i am working with hundred of thousands elements.
        var computedStyle = getComputedStyle(domElm);
              for (var i = 0, len = this._options.pseudoElements.length; i < len; i++) {
                    var pseu_name = this._options.pseudoElements[i];
                    if (this._containsPseudo(domElm, ':' + pseu_name)) {
                        var differentParameters = this._getComputedDifference(pseu_name, computedStyle, domElm);
                        console.log(differentParameters);
                    }
                };
      }

        _getComputedDifference(pseu_name, computed2, domElm) {
            var computed1 = getComputedStyle(domElm, ':' + pseu_name);
            var array1 = [], array2 = [];
            // I belive there is a faster way to convert getComputedStyle to key-value array.
            for (var i = 0; i < computed1.length; i++) {
                var key = computed1[i];
                var value = computed1.getPropertyValue(key);
                if (key != "" && key != null) {
                    array1[i] = value; // i believe this part is incorrect, i mean array-key should be the "key" variable, but i get JS errors.
                }
            }
            for (var i = 0; i < computed2.length; i++) {
                var key = computed2[i];
                var value = computed2.getPropertyValue(key);
                if (key != "" && key != null) {
                    array2[i] = value; // i believe this part is incorrect, i mean array-key should be the "key" variable, but i get JS errors.
                }
            }
            return array1.filter(val => !array2.includes(val));
        }

    _containsPseudo(node, selector) {
        // this method works only with :empty, :hover and so on. :before and :after does not work.
        var nativeMatches = (node.matches || node.msMatchesSelector);
        try {
            return(nativeMatches.call(node, selector));
        } catch (error) {
            return false;
        }
    }