umy-ui/tools/utils/types.js

一个基于 vue 的 PC 端表格UI库，解决万级数据渲染卡顿问题，过万数据点击全选卡顿，等等问题

export function isString(obj) {
  return Object.prototype.toString.call(obj) === '[object String]';
}

export function isNumber(obj) {
  return Object.prototype.toString.call(obj) === '[object Number]';
}

export function isObject(obj) {
  return Object.prototype.toString.call(obj) === '[object Object]';
}

export function isHtmlElement(node) {
  return node && node.nodeType === Node.ELEMENT_NODE;
}

export const isFunction = (functionToCheck) => {
  var getType = {};
  return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
};

export const isUndefined = (val)=> {
  return val === void 0;
};

export const isDefined = (val) => {
  return val !== undefined && val !== null;
};