需求：联级选择器获取的是一个数组，但是后端一般只存最后一级id，回显时需要自己处理数据

思路：利用最后一级id反查出上级id

    /***回显多级** @param {key} 后端拿到的id* @param {treeData}  options绑定数据* @returns*/changeDetSelect(key, treeData) {let arr = [];let returnArr = [];let depth = 0;function childrenEach(childrenData, depthN) {for (let j = 0; j < childrenData.length; j++) {depth = depthN;arr[depthN] = childrenData[j].id;if (childrenData[j].id == key) {returnArr = arr.slice(0, depthN + 1);break;} else {if (childrenData[j].children) {depth++;childrenEach(childrenData[j].children, depth);}}}return returnArr;}return childrenEach(treeData, depth);},