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                [TOC] * * * * * ## 1 indexOf() 查找目標字符串首次出現位置信息 ~~~ stringObject.indexOf(searchvalue,fromindex) ~~~ > searchvalue:必須檢索的字符串 > fromindex:搜索開始位置 > 返回首次出現位置,查找失敗返回-1,大小寫敏感 實例 ~~~ <script type="text/javascript"> var str="Hello world!" document.write(str.indexOf("Hello") + "<br />") document.write(str.indexOf("World") + "<br />") document.write(str.indexOf("world")) </script> ~~~ 輸出 ~~~ 0 -1 6 ~~~
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