主题
indexOf
js
_.indexOf(array, value, [fromIndex=0])使用 SameValueZero 进行相等比较,获取在 array 中找到第一个 value 的索引。如果 fromIndex 为负,则将其用作距 array 末尾的偏移量。
¥Gets the index at which the first occurrence of value is found in array using SameValueZero for equality comparisons. If fromIndex is negative, it's used as the offset from the end of array.
新增于
¥Since
0.1.0
参数
¥Arguments
array(数组):要检查的数组。¥
array(Array): The array to inspect.value(*):要搜索的值。¥
value()*: The value to search for.[fromIndex=0](数值):要从中搜索的索引。¥
[fromIndex=0](number): The index to search from.
返回
¥Returns
(数值):返回匹配值的索引,否则为 -1。
¥(number): Returns the index of the matched value, else -1.
示例
¥Example
js
_.indexOf([1, 2, 1, 2], 2);
// => 1
// Search from the `fromIndex`.
_.indexOf([1, 2, 1, 2], 2, 2);
// => 3