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Array.prototype.myIndexOf = function (value, fromIndex) {const len = this.lengthlet index = -1fromIndex = fromIndex === undefined ? 0 : fromIndexif (fromIndex < 0) {fromIndex = len + fromIndex;fromIndex = fromIndex < 0 ? 0 : fromIndex;}for (let i = fromIndex; i < len; i++) {if (this[i] === value) {index = i;break;}}return index}
Great.
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Array.prototype.myIndexOf = function (value, fromIndex) {
const len = this.length
let index = -1
fromIndex = fromIndex === undefined ? 0 : fromIndex
if (fromIndex < 0) {
fromIndex = len + fromIndex;
fromIndex = fromIndex < 0 ? 0 : fromIndex;
}
for (let i = fromIndex; i < len; i++) {
if (this[i] === value) {
index = i;
break;
}
}
return index
}
第 151 题：用最简洁代码实现 indexOf 方法？