The angular-from-0-to-1 from huahuadavids

angular-from-0-to-1's Introduction

👋 Hi, I’m @huahuadavids from shanghai, working as a front end developer from 2013.
👀 I’m interested in javascript, java, Go, c#, I can work in web, mobile, desktop and so on.
🌱 I’m currently learning 3d development and golang.
💞️ I’m looking to for a oversea job in Australia, New zealand or USA or Canada and for an opportunity to run(润).
📫 How to reach me, [email protected] or [email protected].

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angular-from-0-to-1's Issues

step001 init the scope, Scope Objects

Here , the scope of angular is a construction function that has many fns and attrs

function Scope() {
   this.$$watchers = []; 
  // the prefix $$ represents a private variable
  // the watchers in this collection
}

step002 a watcher and a $digest method

The $$watchers is a collection of the watchers , a watcher has a watchFn(return the data) and a listerFn(some opreations according to the data change)

// the function $watch , you can attach a watcher to a scope
Scope.prototype.$watch = function(watchFn, listenerFn) {
  var watcher = {
     watchFn: watchFn,
     listenerFn: listenerFn
  };
  this.$$watchers.push(watcher);
};
// $digest  iterates over all registered watchers and calls their listener functions
Scope.prototype.$digest = function() {
  _.forEach(this.$$watchers, function(watcher) {
    watcher.listenerFn();
  });
};

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