英文:
How can I pass an array of string `string[]` from js to go using `syscall/js`
问题
有这样一个Go函数：
func WasmCount(this js.Value, args []js.Value) interface{} {const firstParam = args[0].ArrayOfString() // <-- 我想要实现这个return firstParam.Length}
我将在JavaScript中这样调用它：
WasmCount(["a", "b"]) // 应该返回2
我可以传递String和Int，但找不到传递Array of <T>的方法。
英文:
having this go function
func WasmCount(this js.Value, args []js.Value) interface {} {const firstParam = args[0].ArrayOfString() // <-- I want to achieve thisreturn firstParam.Length}
and I will call it from js like this
WasmCount(["a", "b"]) // it should return 2
I can pass String and Int but didn't find a way to pass an Array of <T>
答案1
得分: 2
这是Go代码从js.Value中提取切片的责任。请参考下面的示例：
func WasmCount(this js.Value, args []js.Value) any {if len(args) < 1 {fmt.Println("参数数量无效")return nil}arg := args[0]if arg.Type() != js.TypeObject {fmt.Println("第一个参数应该是一个数组")return nil}firstParam := make([]string, arg.Length())for i := 0; i < len(firstParam); i++ {item := arg.Index(i)if item.Type() != js.TypeString {fmt.Printf("索引为%d的项应该是一个字符串\n", i)return nil}firstParam[i] = item.String()}return len(firstParam)}
这个示例修改自这个答案：https://stackoverflow.com/a/76082718/1369400。
英文:
It's the go code's responsibility to extract the slice from a js.Value. See the demo below:
func WasmCount(this js.Value, args []js.Value) any {if len(args) < 1 {fmt.Println("invalid number of args")return nil}arg := args[0]if arg.Type() != js.TypeObject {fmt.Println("the first argument should be an array")return nil}firstParam := make([]string, arg.Length())for i := 0; i < len(firstParam); i++ {item := arg.Index(i)if item.Type() != js.TypeString {fmt.Printf("the item at index %d should be a string\n", i)return nil}firstParam[i] = item.String()}return len(firstParam)}
This demo is modified from this answer: https://stackoverflow.com/a/76082718/1369400.
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