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node_modules/element-ui/src/utils/util.js 2.77 KB
2a09d1a4   liuqimichale   添加宜春 天水 宣化
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  import Vue from 'vue';
  
  const hasOwnProperty = Object.prototype.hasOwnProperty;
  
  export function noop() {};
  
  export function hasOwn(obj, key) {
    return hasOwnProperty.call(obj, key);
  };
  
  function extend(to, _from) {
    for (let key in _from) {
      to[key] = _from[key];
    }
    return to;
  };
  
  export function toObject(arr) {
    var res = {};
    for (let i = 0; i < arr.length; i++) {
      if (arr[i]) {
        extend(res, arr[i]);
      }
    }
    return res;
  };
  
  export const getValueByPath = function(object, prop) {
    prop = prop || '';
    const paths = prop.split('.');
    let current = object;
    let result = null;
    for (let i = 0, j = paths.length; i < j; i++) {
      const path = paths[i];
      if (!current) break;
  
      if (i === j - 1) {
        result = current[path];
        break;
      }
      current = current[path];
    }
    return result;
  };
  
  export function getPropByPath(obj, path, strict) {
    let tempObj = obj;
    path = path.replace(/\[(\w+)\]/g, '.$1');
    path = path.replace(/^\./, '');
  
    let keyArr = path.split('.');
    let i = 0;
    for (let len = keyArr.length; i < len - 1; ++i) {
      if (!tempObj && !strict) break;
      let key = keyArr[i];
      if (key in tempObj) {
        tempObj = tempObj[key];
      } else {
        if (strict) {
          throw new Error('please transfer a valid prop path to form item!');
        }
        break;
      }
    }
    return {
      o: tempObj,
      k: keyArr[i],
      v: tempObj ? tempObj[keyArr[i]] : null
    };
  };
  
  export const generateId = function() {
    return Math.floor(Math.random() * 10000);
  };
  
  export const valueEquals = (a, b) => {
    // see: https://stackoverflow.com/questions/3115982/how-to-check-if-two-arrays-are-equal-with-javascript
    if (a === b) return true;
    if (!(a instanceof Array)) return false;
    if (!(b instanceof Array)) return false;
    if (a.length !== b.length) return false;
    for (let i = 0; i !== a.length; ++i) {
      if (a[i] !== b[i]) return false;
    }
    return true;
  };
  
  export const escapeRegexpString = (value = '') => String(value).replace(/[|\\{}()[\]^$+*?.]/g, '\\$&');
  
  // TODO: use native Array.find, Array.findIndex when IE support is dropped
  export const arrayFindIndex = function(arr, pred) {
    for (let i = 0; i !== arr.length; ++i) {
      if (pred(arr[i])) {
        return i;
      }
    }
    return -1;
  };
  
  export const arrayFind = function(arr, pred) {
    const idx = arrayFindIndex(arr, pred);
    return idx !== -1 ? arr[idx] : undefined;
  };
  
  // coerce truthy value to array
  export const coerceTruthyValueToArray = function(val) {
    if (Array.isArray(val)) {
      return val;
    } else if (val) {
      return [val];
    } else {
      return [];
    }
  };
  
  export const isIE = function() {
    return !Vue.prototype.$isServer && !isNaN(Number(document.documentMode));
  };
  
  export const isEdge = function() {
    return !Vue.prototype.$isServer && navigator.userAgent.indexOf('Edge') > -1;
  };