object_setDefault

If object does not have key, add it.

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.gf.qytechs.cn/scripts/427473/937466/object_setDefault.js

Added method setDefault to object prototype.

function setDefault (key, value)

If object does not have key, add it with value value

key (string, required)
    key to check
value (any, optional, default = undefined)
    value for key if it's not present

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