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**HTML**
{{ name }}

js核心內(nèi)容

function vueTouch(el,binding,type){
  var _this=this;
  this.obj=el;
  this.binding=binding;
  this.touchType=type;
  this.vueTouches={x:0,y:0};
  this.vueMoves=true;
  this.vueLeave=true;
  this.longTouch=true;
  this.vueCallBack=typeof(binding.value)=="object"?binding.value.fn:binding.value;
  this.obj.addEventListener("touchstart",function(e){
    _this.start(e);
  },false);
  this.obj.addEventListener("touchend",function(e){
    _this.end(e);
  },false);
  this.obj.addEventListener("touchmove",function(e){
    _this.move(e);
  },false);
};
vueTouch.prototype={
  start:function(e){
    this.vueMoves=true;
    this.vueLeave=true;
    this.longTouch=true;
    this.vueTouches={x:e.changedTouches[0].pageX,y:e.changedTouches[0].pageY};
    this.time=setTimeout(function(){
      if(this.vueLeave&&this.vueMoves){
        this.touchType=="longtap"&&this.vueCallBack(this.binding.value,e);
        this.longTouch=false;
      };
    }.bind(this),1000);
  },
  end:function(e){
    var disX=e.changedTouches[0].pageX-this.vueTouches.x;
    var disY=e.changedTouches[0].pageY-this.vueTouches.y;
    clearTimeout(this.time);
    if(Math.abs(disX)>10||Math.abs(disY)>100){
      this.touchType=="swipe"&&this.vueCallBack(this.binding.value,e);
      if(Math.abs(disX)>Math.abs(disY)){
        if(disX>10){
          this.touchType=="swiperight"&&this.vueCallBack(this.binding.value,e);
        };
        if(disX<-10){
          this.touchType=="swipeleft"&&this.vueCallBack(this.binding.value,e);
        };
      }else{
        if(disY>10){
          this.touchType=="swipedown"&&this.vueCallBack(this.binding.value,e);
        };
        if(disY<-10){
          this.touchType=="swipeup"&&this.vueCallBack(this.binding.value,e);
        }; 
      };
    }else{
      if(this.longTouch&&this.vueMoves){
        this.touchType=="tap"&&this.vueCallBack(this.binding.value,e);
        this.vueLeave=false
      };
    };
  },
  move:function(e){
    this.vueMoves=false;
  }
};
Vue.directive("tap",{
  bind:function(el,binding){
    new vueTouch(el,binding,"tap");
  }
});
Vue.directive("swipe",{
  bind:function(el,binding){
    new vueTouch(el,binding,"swipe");
  }
});
Vue.directive("swipeleft",{
  bind:function(el,binding){
    new vueTouch(el,binding,"swipeleft");
  }
});
Vue.directive("swiperight",{
  bind:function(el,binding){
    new vueTouch(el,binding,"swiperight");
  }
});
Vue.directive("swipedown",{
  bind:function(el,binding){
    new vueTouch(el,binding,"swipedown");
  }
});
Vue.directive("swipeup",{
  bind:function(el,binding){
    new vueTouch(el,binding,"swipeup");
  }
});
Vue.directive("longtap",{
  bind:function(el,binding){
    new vueTouch(el,binding,"longtap");
  }
});

2018-03-08

有朋友提出一個bug

“v-for循環(huán) 生命周期后 獲取不到新值 比如更新了數(shù)據(jù)”

這個問題是v-for的就地復(fù)用機(jī)制導(dǎo)致的，也就是可以復(fù)用的dom沒有重復(fù)渲染，官方給出的方法是需要為每項提供一個唯一 key 屬性。理想的 key 值是每項都有的且唯一的 id。