BackboneJS model.has()方法
如果該屬性設置為一個非空或非不定值,此方法返回true。
語法
model.has(attribute)
參數:
- attribute: 屬性定義創建的模型的屬性。
示例
<!DOCTYPE html> <head> <title> Model Example</title> <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script> <script type="text/javascript"> var Company = Backbone.Model.extend(); var company=new Company(); company.set({ Name: "YiiBai", comp_site:"www.gitbook.net"}); if(company.has('comp_site')) { document.write("The model Company has site: True"); } else { document.write("The model Company has site: False"); } </script> </head> <body></body> </html>
輸出
讓我們進行以下步驟來看看上麵的代碼工作:
-
保存上述代碼在文件has.html
-
打開瀏覽器這個HTML文件。