// 增加

addItem: function () {

var n = this.signForm.signFormList ? this.signForm.signFormList.length + 1 : 1;

	this.signForm.signFormList.push({

	  title: '标题' + n,

	  require: false

	});

},

// 删除

removeItem: function (item) {

	const index = this.signForm.signFormList.indexOf(item);

	this.signForm.signFormList.splice(index, 1);

},

// 置顶

moveTop: function (item) {

	const index = this.signForm.signFormList.indexOf(item);

	if(index != 0){

	  this.signForm.signFormList.splice(index,1);

	  this.signForm.signFormList.splice(0,0,item);

	}

},

// 上移

moveUp: function (item) {

	const index = this.signForm.signFormList.indexOf(item);

	if(index != 0){

		this.signForm.signFormList.splice(index,1);

		this.signForm.signFormList.splice(index-1,0,item);

	}

},

// 下移

moveDown: function (item) {

	const index = this.signForm.signFormList.indexOf(item);

	const max = this.signForm.signFormList.length ;

	if(index != max){

	  this.signForm.signFormList.splice(index,1);

	  this.signForm.signFormList.splice(index+1,0,item);

	}

},

<el-table

	:span-method="arraySpanMethod"

	// ...

	/>