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src/utils/assist.js 3.71 KB
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  // 判断参数是否是其中之一
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  export function oneOf (value, validList) {
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      for (let i = 0; i < validList.length; i++) {
          if (value === validList[i]) {
              return true;
          }
      }
      return false;
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  }
  
  export function camelcaseToHyphen (str) {
      return str.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
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  }
  
  // For Modal scrollBar hidden
  let cached;
  export function getScrollBarSize (fresh) {
      if (fresh || cached === undefined) {
          const inner = document.createElement('div');
          inner.style.width = '100%';
          inner.style.height = '200px';
  
          const outer = document.createElement('div');
          const outerStyle = outer.style;
  
          outerStyle.position = 'absolute';
          outerStyle.top = 0;
          outerStyle.left = 0;
          outerStyle.pointerEvents = 'none';
          outerStyle.visibility = 'hidden';
          outerStyle.width = '200px';
          outerStyle.height = '150px';
          outerStyle.overflow = 'hidden';
  
          outer.appendChild(inner);
  
          document.body.appendChild(outer);
  
          const widthContained = inner.offsetWidth;
          outer.style.overflow = 'scroll';
          let widthScroll = inner.offsetWidth;
  
          if (widthContained === widthScroll) {
              widthScroll = outer.clientWidth;
          }
  
          document.body.removeChild(outer);
  
          cached = widthContained - widthScroll;
      }
      return cached;
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  }
  
  // watch DOM change
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  export const MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver || false;
  
  const SPECIAL_CHARS_REGEXP = /([\:\-\_]+(.))/g;
  const MOZ_HACK_REGEXP = /^moz([A-Z])/;
  
  function camelCase(name) {
      return name.replace(SPECIAL_CHARS_REGEXP, function(_, separator, letter, offset) {
          return offset ? letter.toUpperCase() : letter;
      }).replace(MOZ_HACK_REGEXP, 'Moz$1');
  }
  // getStyle
  export function getStyle (element, styleName) {
      if (!element || !styleName) return null;
      styleName = camelCase(styleName);
      if (styleName === 'float') {
          styleName = 'cssFloat';
      }
      try {
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          const computed = document.defaultView.getComputedStyle(element, '');
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          return element.style[styleName] || computed ? computed[styleName] : null;
      } catch(e) {
          return element.style[styleName];
      }
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  }
  
  // firstUpperCase
  function firstUpperCase(str) {
      return str.toString()[0].toUpperCase() + str.toString().slice(1);
  }
  
  // Warn
  export function warnProp(component, prop, correctType, wrongType) {
      correctType = firstUpperCase(correctType);
      wrongType = firstUpperCase(wrongType);
      console.error(`[iView warn]: Invalid prop: type check failed for prop ${prop}. Expected ${correctType}, got ${wrongType}. (found in component: ${component})`);
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  }
  
  function typeOf(obj) {
      const toString = Object.prototype.toString;
      const map = {
          '[object Boolean]'  : 'boolean',
          '[object Number]'   : 'number',
          '[object String]'   : 'string',
          '[object Function]' : 'function',
          '[object Array]'    : 'array',
          '[object Date]'     : 'date',
          '[object RegExp]'   : 'regExp',
          '[object Undefined]': 'undefined',
          '[object Null]'     : 'null',
          '[object Object]'   : 'object'
      };
      return map[toString.call(obj)];
  }
  
  // deepCopy
  function deepCopy(data) {
      const t = typeOf(data);
      let o;
  
      if (t === 'array') {
          o = [];
      } else if ( t === 'object') {
          o = {};
      } else {
          return data;
      }
  
      if (t === 'array') {
          for (let i = 0; i < data.length; i++) {
              o.push(deepCopy(data[i]));
          }
      } else if ( t === 'object') {
          for (let i in data) {
              o[i] = deepCopy(data[i]);
          }
      }
      return o;
  }
  
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  export {deepCopy};