element-ui 格式化树形数组在table组件中展示（单元格合并）

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最近做的项目涉及到很多单元格合并问题，element-ui组件对于单元格合并的处理虽然很灵活，但是需要事先计算好每个单元格合并的rowspan和colspan，直接在span-method属性中计算实现起来有点困难，所以我拿到列表后先把每条数据的需要合并的rowspan计算出来然后直接在span-method属性中返回即可。上代码：

export const merge = function(
colArr,
list
) {
var allProps = [];
colArr.forEach((props, index) => {
allProps.push(...props);
list = getLevel(props, allProps, list);
});
return list;
};//组装层
function getLevel(props, allProps, list) {
var rowKey = {};
for (var item of list) {
let propInfo = getPropStr(allProps, item);
if (rowKey[propInfo.key]) {
rowKey[propInfo.key].children.push(item);
} else {
let obj = propInfo;
obj.children = [item];
rowKey[propInfo.key] = obj;
}
}
let info = [];
for (var key in rowKey) {
rowKey[key].children.forEach((item, index) => {
if (index == 0) {
item = Object.assign(
item,
getMergeInfo(props, rowKey[key].children.length)
);
} else {
item = Object.assign(item, getMergeInfo(props, 0));
}
info.push(item);
});
}
return info;
}//获取合并信息
function getMergeInfo(props, num) {
let obj = {};
props.forEach(item => {
obj[item + "_merge"] = {
rowspan: num,
colspan: 1
};
});
return obj;
}
// 把属性的值拼接在一起,并和属性的值一起返回。
function getPropStr(props, info) {
let obj = {};
let propStr = props.map(item => {
obj[item] = info[item];
return info[item];
});
obj.key = propStr.toString();
return obj;
}

导进去直接调用：

var colArr = [["id", "grade"], ["class"]];
var list = [
{ id: 1, grade: 1, class: 1, name: "张三" },
{ id: 1, grade: 1, class: 1, name: "李四" },
{ id: 1, grade: 1, class: 2, name: "王五" },
{ id: 1, grade: 1, class: 2, name: "找六" },
{ id: 2, grade: 2, class: 7, name: "张三_1" },
{ id: 2, grade: 2, class: 7, name: "李四_1" },
{ id: 2, grade: 2, class: 3, name: "王五_1" },
{ id: 2, grade: 2, class: 3, name: "找六_1" }
];
merge(colArr, list)