一些代码片段

[axetroy]

从以前旧博客迁移至此 2016-04-30 01:51:05

发布订阅者模式

var Observer = function () {

};

Observer.prototype = {
  constructor: Observer,
  subscribe: function (eventName, func) {
    if (!this[eventName]) this[eventName] = [];
    this[eventName].push(func);
  },
  publish: function (eventName, data) {
    var _this = this;
    if (!this[eventName]) this[eventName] = [];
    this[eventName].forEach(function (func) {
      func.call(_this, data);
    });
  }
};

var ob = new Observer();
// 订阅
ob.subscribe('dialog', function (data) {
  console.log('there are data:' + data);
});
// 发布
ob.publish('dialog', [1, 2, 3, 4]);

解析多层属性，类似angularJS的$parse服务

function parse(properties) {
  const agm = properties.split('.');

  return function(target, undefined) {
    let result = null;
    (function parseTarget(target, agm) {
      if (target === void 0) {
        console.error(
          'Uncaught TypeError: Cannot read property ' + agm[0] + ' of undefined'
        );
        result = target;
        return result;
      }
      if (agm.length <= 1) {
        result = target[agm[0]];
        return result;
      }
      target = target[agm[0]];
      agm.shift();
      parseTarget(target, agm);
    })(target, agm);

    return result;
  };
}

const o = {
  a: {
    b: {
      c: 233
    }
  }
};

console.log(parse('a.b.c')(o)); // 233