作者:手机用户2502923607 | 来源:互联网 | 2023-09-25 01:10
1、数组的watch
data() {
return {
winChips: new Array(11).fill(0)
}
},
watch: {
winChips: {
handler(newValue, oldValue) {
for (let i = 0; i ) {
if (oldValue[i] != newValue[i]) {
console.log(newValue)
}
}
},
deep: true
}
}
2、对象的watch
data() {
return {
bet: {
pokerState: 53,
pokerHistory: ‘local‘
}
}
},
watch: {
bet: {
handler(newValue, oldValue) {
console.log(newValue)
},
deep: true
}
}
tips:
1.只要bet中的属性发生变化(可被监测到的),便会执行handler函数;
2.如果想监测具体的属性变化,如pokerHistory变化时,才执行handler函数,则可以利用计算属性computed做中间层。
事例如下:
data() {
return {
bet: {
pokerState: 53,
pokerHistory: ‘local‘
}
}
},
computed: {
pokerHistory() {
return this.bet.pokerHistory
}
},
watch: {
pokerHistory(newValue, oldValue) {
console.log(newValue)
}
}
或者:
data() {
return {
bet: {
pokerState: 53,
pokerHistory: ‘local‘
}
}
},
watch: {
‘bet.pokerHistory‘(newValue, oldValue) {
console.log(newValue)
}
}
上面代码块确定不能监测 数组中某个属性值得变化,利用computed做中间层则没有这个限制
参考---https://blog.csdn.net/hdchangchang/article/details/89337971