could not import syscall/js (cannot find package "syscall/js" in GOROOT)

编写wasm时在vscode中引入syscall/js会报如下错误：

could not import syscall/js (cannot find package "syscall/js" in GOROOT)

在vscode的settings中添加上如下配置即可:

{
    "go.toolsEnvVars": {
        "GOOS": "js",
        "GOARCH": "wasm"
    }
}