本文概述
如果属性设置为非null或非未定义值,则Backbone.js Has模型将返回true。
句法:
model.has(attribute)
参数说明
属性:它定义了所创建模型的属性。
让我们举个例子。
请参阅以下示例:
<!DOCTYPE html>
<head>
<title> Has 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: "SSSIT pvt. ltd.", comp_site:"www.sssit.org"});
if(company.has('comp_site'))
{
document.write("The company has a site: True");
}
else
{
document.write("The company has a site: False");
}
</script>
</head>
</html>
输出:
将以上代码保存在has.html文件中,然后在新的浏览器中打开此文件。
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