IndexOf(String, Int32, Int32, StringComparison) Gibt den NULL-basierten Index des ersten Vorkommens der angegebenen Zeichenfolge im aktuellen String-Objekt an. Parameter geben die Anfangssuchposition in der ak
10));// returns -1 as character is not in the stringSystem.out.println("index of letter 'e' = "+ str.indexOf('e', 5));}}编译和运行上面的程序，这
Use the IndexOf() and Substring() helper methods to locate the position of one or more characters inside a larger string, and return the part of the larger string that follows the character positions you specify.
A.indexOf() 在原生JS中只能用于String对象，比如var s=“123”; alert(s.indexOf("1")) // 不会报错 var s=123; alert(s.indexOf("1")) // 报错，因为s是number，这时候你需要把s转换成string才可以运行。如以上回答未解决问题，请尝试：var parr = ["a","b","c","d"];判断pa...
System.out.println(result);// -1// index of empty string in the string result = str1.indexOf(""); System.out.println(result);// 0} } Run Code Notes: The character'a'occurs multiple times in the"Learn Java"string. TheindexOf()method returns the index of the first occurrence of'a...
String.IndexOf() method It is a method of string class, which returns the first index (first occurrence) of the character in a string. Syntax int String.IndexOf(String str); Return Value This method returns integer value; it returns the index when sub-string found in string. If sub-stri...
在JavaScript中,下列关于String对象的charAt()和indexOf()方法,理解正确的有( )。A.charAt()方法是获取指定索引位置的字符B.in
2、使用jQuery的inArray方法,注:jQuery版本2.0以上不再支持IE8 代码语言:javascript 代码运行次数:0 运行 AI代码解释 var arr = [ 1, "2", false, "aaa" ]; jQuery.inArray("aaa", arr); jQuery.inArray(false, arr); jQuery.inArray("2", arr); jQuery.inArray(1, arr, 2); 不存在就为-1...
public static int IndexOf(string? s, string? needle, int start); Parameters s String needle String start Int32 Returns Int32 Remarks Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to...
1:Scanner的使用(了解) (1)在JDK5以后出现的用于键盘录入数据的类。 (2)构造方法: A:讲解了System.in这个东西。 它其实是标准的输入流,对应于键盘录入 B:构造方法 InputStream is = System.in; Scanner(InputStream is) C