-

+

Page({
data: {
yemian: {
num: '0',
num_t: '',
}
},
onLoad: function() {},

//加操作

jia: function () {
var that = this;
var yemian = that.data.yemian;
if (yemian.num == '') {
yemian.num = yemian.num_t;
}
yemian.num = (parseInt(yemian.num) + 1).toString();
that.setData({
yemian: yemian,
});
},
//减操作

jian: function () {
var that = this;
var yemian = that.data.yemian;
if (yemian.num == '0') return;
yemian.num = (parseInt(yemian.num) - 1).toString();
that.setData({
yemian: yemian,
});
},


///获取焦点事件
focus: function (e) {
var that = this;
var yemian = that.data.yemian;
yemian.num_t = yemian.num;
yemian.num = '';
that.setData({
yemian: yemian
});
},
//失去焦点事件

blur: function (e) {
var that = this;
var yemian = that.data.yemian;
if (e.detail.value == '') {
yemian.num = yemian.num_t;
} else {
yemian.num = e.detail.value.toString()
}
that.setData({
yemian: yemian
});
}
})




当input焦点未离开input时，点击+（view），理想值是101，但实际是100，如果仔细看的话应该是101瞬间变为100，






附加问题：

yemian.num = 200;

yemian.num_t = yemian.num;


改 yemian.num = 0;



yemian.num_t 的值也随之改为0



为什么？？？？？？

微信小程序开发问题解答

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