vue checkbox 全选 数据的绑定及获取和计算方法

<span><input type='checkbox' v-model='checked' v-on:click='checkedall'><span class="select-all">全选</span></span>

return {
 dianji:'12',
 list: [],
 value:{},
 value1:{},
 checkall: false,
 checkarr:[],
 checkboxmodel:[],
 wodeshi:'0',
 checked:false
}
lll: function(){
 var self = this;
 var sum=0;
 settimeout(function(){
 for(var x in self.checkboxmodel){
 sum += parseint(self.checkboxmodel[x].split('-')[1])
 }
 self.wodeshi=sum;
 },0)
 // console.log(self.checkboxmodel)
},
checkedall: function() {
 var _this = this;
 if (this.checked) {//实现反选
 _this.checkboxmodel = [];
 }else{//实现全选
 _this.checkboxmodel = [];
 _this.list.foreach(function(z) {
 _this.checkboxmodel.push(z.coach_id+'-'+z.amount);
 });
 }
 if(_this.checkboxmodel.length==0){
 this.wodeshi=0;
 // console.log(_this.checkboxmodel);
 }else {
 var self =this;
 var sum =0;
 for(var x in self.checkboxmodel){
 sum += parseint(self.checkboxmodel[x].split('-')[1])
 }
 self.wodeshi=sum;
 }
},