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需求：输入手机号 -> 点击获取验证码 -> 进入60s倒计时
短信验证码登录
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data: {
seconds: 0, // 读秒
timer: '' // 计时器
},
let that = this
// 开始倒计时
that.setData({
seconds: 60,
timer: setInterval(function(){
let seconds = that.data.seconds
that.setData({ seconds: seconds - 1 })
if (that.data.seconds == 0) {
// 读秒结束 清空计时器
clearInterval(that.data.timer)
}
}, 1000)
})
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