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Not only can you provide default values when using ES6 parameter object destructuring, but you can also require the presence of certain properties.
function ajax({ type = "get", url = requiredParameter("url"), data = {}, success = requiredParameter("success"), error = () => {}, isAsync = true } = {}) { console.log(JSON.stringify({ type, url, data, success, error, isAsync }, null, 2)); } function requiredParameter(name){ console.log(`parameter missing: "${name}"`); } try{ ajax({url: ‘http://api.com‘, data: {name: ‘Zhentian‘}, success: false}) }catch(e){ console.log(JSON.stringify(e)) }
Now, success and url are rueqired, if we don‘t passin success, then it will show:
//"parameter missing: \"success\""
[ES6] ES6 Parameter Object Destructuring with Required Values
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原文地址：http://www.cnblogs.com/Answer1215/p/5751568.html
