判断0和null

config.xml

 <?xml version='1.0' encoding='utf-8'?>
-<widget id="online.hubeidiyi" version="1.1.0" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
+<widget id="online.hubeidiyi" version="1.1.1" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
     <name>牧场云</name>
     <description>牧场物业管理系统</description>
     <author email="van_chen@foxmail.com" href="http://hubeidiyi.online/">Van.chen</author>

src/app/east/east.page.html

@@ -12,7 +12,7 @@
                    style="min-height: calc(100% - 45px)"
     >
     <div class="topPart">
-        <ListItem multipleLine *ngIf="this.yewei">
+        <ListItem multipleLine *ngIf="yewei || yewei === 0">
             当前液位:
             <div class="process">
                 <div [class]="'inlineProcess ' + color" [ngStyle]="{width: proc + '%'}">
@@ -20,7 +20,7 @@
             </div>
             {{yewei.toFixed(2)}}m
         </ListItem>
-        <ListItem multipleLine *ngIf="this.temp">
+        <ListItem multipleLine *ngIf="temp || temp === 0">
             当前温度:
             <div style="display: inline-block;margin-left: calc(100% - 145px);vertical-align: middle">
                 {{temp.toFixed(2)}}℃

src/app/east/east.page.ts

@@ -11,8 +11,8 @@ import {ActivatedRoute} from '@angular/router';
 })
 export class EastPage implements OnInit {
     value = [];
-    yewei = 0;
-    temp = 0;
+    yewei;
+    temp;
     proc = 0;
     duration = 23;
     nanClicked = false;
@@ -140,14 +140,14 @@ export class EastPage implements OnInit {
         }]);
 
         this.api.app.getLiquidLevelData([{fieldRegionNo: this.fieldRegionNo}, (data) => {
-            if (data.liquidLevel) {
+            if (typeof (data.liquidLevel) === 'number') {
                 this.yewei = Number(data.liquidLevel);
                 this.proc = (Number(data.liquidLevel) / (Number(data.liquidLevelMax) * 1.5)) > 1
                     ? 100 : (Number(data.liquidLevel) / (Number(data.liquidLevelMax) * 1.5)) * 100;
                 this.color = Number(data.liquidLevel) > Number(data.liquidLevelMax) ||
                 Number(data.liquidLevel) < Number(data.liquidLevelMin) ? 'red' : '';
             }
-            if (data.temp) {
+            if (typeof (data.temp) === 'number') {
                 this.temp = Number(data.temp);
             }
         }]);

src/app/other/other.page.html

@@ -12,7 +12,7 @@
                    style="min-height: calc(100% - 45px)"
     >
     <div class="topPart">
-        <ListItem multipleLine *ngIf="this.yewei">
+        <ListItem multipleLine *ngIf="yewei || yewei === 0">
             当前液位:
             <div class="process">
                 <div [class]="'inlineProcess ' + color" [ngStyle]="{width: proc + '%'}">
@@ -20,7 +20,7 @@
             </div>
             {{yewei.toFixed(2)}}m
         </ListItem>
-        <ListItem multipleLine *ngIf="this.temp">
+        <ListItem multipleLine *ngIf="temp || temp === 0">
             当前温度:
             <div style="display: inline-block;margin-left: calc(100% - 145px);vertical-align: middle">
                 {{temp.toFixed(2)}}℃

src/app/other/other.page.ts

@@ -12,8 +12,8 @@ import {ActivatedRoute} from '@angular/router';
 export class OtherPage implements OnInit {
     value = [false, false, false, false, false, false, false];
     yewei = 0;
-    temp = 0;
-    proc = 0;
+    temp;
+    proc;
     duration = 23;
     _inv;
     color;
@@ -136,13 +136,13 @@ export class OtherPage implements OnInit {
         }]);
 
         this.api.app.getLiquidLevelData([{fieldRegionNo: this.fieldRegionNo}, (data) => {
-            if (data.liquidLevel) {
+            if (typeof (data.liquidLevel) === 'number') {
                 this.yewei = Number(data.liquidLevel);
                 this.proc = (Number(data.liquidLevel) / (Number(data.liquidLevelMax) * 1.5)) * 100;
                 this.color = Number(data.liquidLevel) > Number(data.liquidLevelMax) ||
                 Number(data.liquidLevel) < Number(data.liquidLevelMin) ? 'red' : '';
             }
-            if (data.temp) {
+            if (typeof (data.temp) === 'number') {
                 this.temp = Number(data.temp);
             }
         }]);