angular4 *ngIf 判断对象数组是否为空
判断对象
"downloadinfo": [
{
"downtype": "16",
"linkvalue": "https://pan.baidu.com/s/1kVutjX9",
"fetchcode": "",
"remark": "",
"ico": "http://i1.fuimg.com/588755/7dcc4108ce360c2a.png"
}
]
模板代码
<div *ngIf="isEmptyObject(downloadinfo); else templateName">downloadinfo不为空</div> <ng-template #templateName>downloadinfo为空</ng-template>
组建代码
public isEmptyObject(obj) {
//console.log(obj.length);
return obj.length;
}
分析
当downloadinfo为空,即: "downloadinfo": []时, obj.length为0.
