yongzeng / yongzeng.github.io

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Iterator #1

Open yongzeng opened 3 years ago

yongzeng commented 3 years ago

for循环 最原始

for (var index = 0; index < myArray.length; index++) { }

forEach 无法跳出循环 ES5

myArray.forEach(item=>{})

for in 对象的循环

for (let i in arr) {} i是键名,键名会转化成字符串。会乱序

for of 数组的循环,替代forEach ES6

for (let i of arr) {} i是键值 键名需要是数字(Uncaught TypeError: object is not iterable)