浮动到表格中某一行，根据改行信息高亮某区域文字，并设置对应滚动高度，使高亮文字出现在当前视野

事先说明，此代码结合应用项目场景，故这里的代码很难理解，纯本人笔记

            highlightOpinion: function (opinion) {
                $scope.mark.highlightContent = $scope.mark.highlightContentStore;//highlightContentStore是后台接受不带高亮效果的文字

                var reg = new RegExp();
                var replaceStr = ‘‘;
                for (var k in opinion) {
                    if (k == ‘评论关键字‘) {
                        if (opinion[k] !== ‘ ‘ && opinion[k] !== ‘/‘) {
                            reg = new RegExp(opinion[k], ‘ig‘);
                            replaceStr = `<span class="color-bg-green">${opinion[k]}</span>`;
                            $scope.mark.highlightContent = $scope.mark.highlightContent.replace(reg, replaceStr);
                        }
                    } else if (k == ‘评论小类‘) {
                        if (opinion[k] !== ‘ ‘ && opinion[k] !== ‘/‘) {
                            reg = new RegExp(opinion[k], ‘ig‘);
                            replaceStr = `<span class="color-bg-blue">${opinion[k]}</span>`;
                            $scope.mark.highlightContent = $scope.mark.highlightContent.replace(reg, replaceStr);
                        }
                    }
                }

                //滚动条移动到该词语
                var ele = document.getElementById(‘textarea2‘);
                var scrollHeight = ele.scrollHeight,
                    totalStrLength = ele.value.length,
                    currentStr = ele.value.toLowerCase().indexOf(opinion[‘评论关键字‘].toLowerCase()) == -1 ?
                     ele.value.toLowerCase().indexOf(opinion[‘评论小类‘].toLowerCase()) :
                     ele.value.toLowerCase().indexOf(opinion[‘评论关键字‘].toLowerCase());
                $timeout(function () {
                    if (currentStr == -1) return; //说明原文中不包含评论关键字和评论小类
                    var eleCopy = document.getElementById(‘textarea2-copy‘);
                    eleCopy.scrollTop = (scrollHeight * currentStr / totalStrLength - 20 > 0) ? (scrollHeight * currentStr / totalStrLength - 20) : (currentStr / totalStrLength);
                }, 0);
                $scope.mark.showHighlight = true;
            },

效果：