IndexOf () and LastIndexOf () method search string

Description and function of IndexOf () and LastIndexOf () method

Both the IndexOf () and the LastIndexOf () methods are search strings. Among them, IndexOf () is the previous search, LastIndexOf () is the search from the back forward. Their return value is where the substring began, and this position is counted from 0 onwards. Returns-1 if it is not found. Second, the example

<mce:script language= "JavaScript" > <!--var sStr = "ABcdefghijk1234567890" document.write (Sstr.indexof ("A") + "<br>"); document.write (Sstr.indexof ("9", 7) + "<br>"); document.write (Sstr.lastindexof ("I") + "<br>"); document.write (Sstr.lastindexof ("K", 10+ "<br>"); document.write (Sstr.lastindexof ("V", 2) + "<br>"); document.write (SSTR); --> </mce:script>

Results:

0 19 8 10 -1 ABcdefghijk1234567890