变量的类型注释

当您使用 constvarlet 声明变量时,您可以选择添加类型注释以显式指定变量的类型:

When you declare a variable using const, var, or let, you can optionally add a type annotation to explicitly specify the type of the variable:

let myName: string = "Alice";
//        ^^^^^^^^ Type annotation

jztKwiE9oNFEscSk0gInexrzMrQ22uGw5s2AN7d0gf4WgTPvyH89Zl56cs4vxWV+wURptOxAp9AsQPLJ9qkjJp/8Qh3wSYr4bfy27CMPpv5H8zFIruYhCGx8PM0c2swCXVSdgBQmTt4CjvQoH+tDaErfW16xLjR+Fxrku1Rti1ojK5hDpR99zDrhjkzEtAQshs2Eh7rv5VctAsHY7R4StTOKNhi/eLMdEHFlDp2FFC41tX9pupFFkEqZfTx8mhK2G5m4s/cbrPdp++C0LikyZcgBoXx1AV2/tVlZhhdv8Mn+uER7nhuUgDNa1mTiMveVYKsNN7Fyhjx3HMGfz14/zxltwuALK83/WOFPGciBviKLOUZjZTXPJ0/cHuhtdrtRTXuHWQByCW7q4LptyRLFWAaxUvCKyCGB4/i5NuVcuRw+CyQo3bonYeflWqlrzqJQ

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

// No type annotation needed -- 'myName' inferred as type 'string'
let myName = "Alice";

f5OWU113nulqstWMtLQVoIB04Aksep6pkQnMpqw0p8wBjsNmKm+pVcavDLAhgSL2OH5rRcQVRIWw+zBqiAYNG+5RGpzv3Nlu3u76ipRMgdeB5g3bvx6TD5au0VxacxjgJB00TtHRgjoPUKU9ZFf++Oxeyi9YbWRTnxMFJqPupw1OYtvvBYbmrSx5paJkW+pVmVKPY3vRVszE/Z9vLFZL2RknKnfFuJAxeTZ/eFMKVNeE3fS8cJsTB5tMrjAzgOeq9S45l4CmZoVeJfbyqt5UafL7rDqRVOOJMmUdJu9l0/7iueH2uWAwVPXJLoP7Er2vZYoZ1jue1FledBSiYLNo6ehQmBtOrO3ln/ZaEGGpa9uZfAM+SzgpEgNjzFYHKM0E0NDsKkRC/lXM8nlWKpbJXy/haCEEgLTaCLD3/nTuNkINT2WEAI+OusdWqvFHotLSIMQTCmOjfdVSshc5tff4rzui6f5jGwbKCh14ArWfnCW6ELLZTKK08ZMzAMhFDa8Twn4Sc5nOGposmbkqjSTdqGbLNHgTJUVo6/tXOlrVuklBsQjlQ9zPaUIlcswj6mTTP7wCYRtg61PJeJ4+M9XpuGnnR6mfiHCWQVmbjyJ7rKv4jSkfkPT0HlGZS4oD/OeqVtzo3Ecf7pKIQlBAHFJWhw==