Js的一点小菜

var add = function(a){
    return function(b){
        return function(c){
            return a+b+c;
        };
    };
};
 
add(1)(2)(3); //6

function add(a){
 var tmp = function(b){return add(a+b);}
 tmp.toString=tmp.valueOf=function(){return a;}
 return tmp;
}

var result = add(1)(2)(3)
console.log(result)  // 会输出 function 6;
typeof add(1) // "function"
typeof add(1).toString() // "number"
alert(result)  // 弹出数字 6

function array2func(arr){
 var i=0,len,result=[];
 for(len=arr.length;i<len;i++){
    var func = (function(value){
            return function (){
              console.log(value)
            }
       })(arr[i])
    result.push(func) 
  }
 return result;
}

function Observer() {
  this.fns = []
}

Observer.prototype.subscribe = function(fn){
  this.fns.push(fn)
}

Observer.prototype.unsubscribe = function(fn){
  this.fns = this.fns.filter(function(item){
    if(item !== fn){
      return item
    }
  })
}

Observer.prototype.update = function(o,thisObj){
  var scope = thisObj || window;
  this.fns.forEach(function(itemFn){
    itemFn.call(scope,o)
  })
}


var observer = new Observer;

var fn1 = function(data){
  console.log(data+'快点跑啊！')
}
var fn2 = function(data){
  console.log(data+'做饭了！！！')
}

observer.subscribe(fn1)
observer.subscribe(fn2)
observer.update('二狗子')



var dom = {
  on:function(node,eventType,handler){
    if(node.addEveentLisen){
      node.addEventListener(eventType,handler,false)
    }else(
      node.attachEvent('on'+eventType,handler)
    )
  },
  off:function(node,eventType,handler){
    if(node.removeEventLinstener){
      node.removeEventLinstener(''eventType,handler,false)
    }else{
      node.detatchEvent('on'+eventType,handler)
    }
  },
  //获取元素样式
  getStyle:function(node,styleName){
    var realStyle = null;
    if(window.getComputedStyle){
      realStyle = window.getComputedStyle(node,null)[styleName]
    }else if(node.currentStyle){
      realStyle = node.currentStyle[styleName]
    }
    return realStyle;
  },
  //设置元素样式
  setCss:function(node,css){
    for(var key in css){
      if(css.hasOwnProprty(key)){
        node.style[key] = css[key]
      }
    }
  }
}