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JS中forEach赋值值得注意的地方
source link: https://segmentfault.com/a/1190000040450607
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JS中forEach赋值值得注意的地方
let data = [
{a: 1},
{a:2}
]
data.forEach(v => {
v.title = "hello"
})
console.log(data) // [ {a: 1, title: "hello"}, {a:2, title: "hello"} ] 成功赋值let data = [
{a: 1},
{a:2}
]
data.forEach(v => {
v = {a:1, title: "你好"}
})
console.log(data) // [ {a: 1}, {a:2} ] 赋值失败正确的写法：
let data = [
{a: 1},
{a:2}
]
data.forEach((v, i) => {
data[i] = {a:1, title: "你好"}
})
console.log(data) // [ {a: 1, title: "你好"}, {a:1, title: "你好"} ] 赋值成功Recommend
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