Handlebars:
Template
{{#if (isdefined value1)}}true{{else}}false{{/if}}
{{#if (isdefined value2)}}true{{else}}false{{/if}}
Preparation-Script
Handlebars.registerHelper('isdefined', function (value) {
  return value !== undefined;
});
Input
{ value1: {} }
Output
true
false
最后更新: 2/23/2020, 2:00:21 AM