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                ## **解釋一下JS同源策略** * 同源策略是客戶端腳本(尤其是JavaScript)中重要的安全度量標準,它最早出自Netscape Navigator 2.0,目的是防止某個文檔或腳本從多個不同源裝載 **這里的同源**指的是**協議、域名、端口相同**。同源策略是一種**安全協議**,指一段**腳本**只能**讀取**同一來源的窗口和文檔的屬性。
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