app返回提示：是否保存编辑信息
表单内容过多时，用户编辑表单，编辑到一半，返回时询问保存编辑信息，保存后下次进来自动填写保存的表单内容。
onBackPress(e) {
const that = this;
if (e.from == "backbutton") {
if (!that.isEdit) {
uni.showModal({
title: "提示",
content: "是否保留此次编辑？",
success(res) {
if (res.confirm) {
// 保存编辑（执行创建数据缓存的方法）
that.createDataStorageSync()
uni.navigateBack()
} else {
uni.navigateBack()
}
}
})
} else {
uni.navigateBack()
}
return true; //阻止默认返回行为
}
},
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