vue自定义可传参指令

Vue.directive('longpress',function(el,binding,vNode){
	console.log(el,binding,vNode)
	let timer = null;
	var start = function(e){
		if(e.type == 'click') return;
		if(timer==null){
			timer = setTimeout(function() {
				binding.value()
			}, 1000);
		}
	};
	var cancel = function(){
		if(timer!== null){
			clearTimeout(timer)
			timer = null
		}
	};
	el.addEventListener('mousedown',start);
	el.addEventListener('touchstart',start);
	
	el.addEventListener("click", cancel);
	el.addEventListener("mouseout", cancel);
	el.addEventListener("touchend", cancel);
	el.addEventListener("touchcancel", cancel);
})
<span v-for="item in history" v-longpress="pressDlt">{{item}}</span>正确书写方式
<span v-for="item in history" v-longpress="pressDlt（item）">{{item}}</span>这样写会报错

如何把item传进去