<div id="classBind">
<span :class="{warning:isWarning,safe:isSafe}" v-on:click="toggle">
状态:{{alert}}{{isSafe}}
</span>
</div>
//js
var app11=new Vue({
el:'#classBind',
data:{
isWarning:true,
alertList:['红色警报','警报解除'],
alert:''
},
computed:{
isSafe:function(){
return !this.isWarning;
}
},
methods:{
toggle:function(){
this.isWarning=!this.isWarning;
this.alert= this.isWarning?this.alertList[0]:this.alertList[1];
}
}
});

.warning{
color:#f24;
}
.safe{
color:#42b983;
}

var app11=new Vue({
el:'#classBind',
data:{
isWarning:true,
alertList:['红色警报','警报解除'],
alert:''
},
computed: {
isSafe: function () {
return !this.isWarning;
},
classObj:function(){
return {
warning: this.isWarning,
safe:this.isSafe
}
}
},
methods:{
toggle:function(){
this.isWarning=!this.isWarning;
this.alert= this.isWarning?this.alertList[0]:this.alertList[1];
}
}
});

<div v-bind:class="classArray" @click="removeClass()">去掉class</div>

data: {
classArray:["big",'red']
}
methods:{
removeClass:function(){
　　this.classArray.pop();
}
}

.big{
font-size:2rem;
}
.red{
color:red; 
}

<div id="styleBind">
<span :style="{color:theColor,fontSize:theSize+'px'}" @click="bigger">styleBind</span>
</div>

var app12=new Vue({
el:'#styleBind',
data:{
theColor:'red',
theSize:14
},
methods:{
bigger:function(){
this.theSize+=2;
}
}
});