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var ary = [ { id: 1, name: "Zhentian" }, { id: 2, name: "Alice" } ];
for..in
Print out the props name
for(let person in ary){ console.log(person); // "0", "1" }
for..of
Print out the value
for(let person of ary){ console.log(person); } /* [object Object] { id: 1, name: "Zhentian" } [object Object] { id: 2, name: "Alice" } */
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原文地址：http://www.cnblogs.com/Answer1215/p/5078522.html
