点击按钮实现复制的功能

                    <input class="big" v-model="link" id="textAreas"/>
                <div class="alertBtn" @click="copy">复制链接</div>


		var obj = document.getElementById("textAreas");
		console.log(obj)
		obj.select(); 
		try{
			if(document.execCommand("Copy","false",null)){
				_this.message = "复制成功"
			// alert("复制成功");
			}else{
				_this.message = "复制失败"
			// alert("复制失败！");
			}
		}catch(err){
			_this.message = "复制错误！"
			// alert("复制错误！")
		}