Can I ask what the difference is between string object slice() and substr() in JavaScript? Share. ... <看更多>

String.prototype.substr(). substr() 函数用于返回当前字符串中一个连续的片段。 语法. str. ... <看更多>

indexOf() returns the index of the first occurrence of substring ( substr ) in a string ( str ):. let index = str.indexOf(substr, [, fromIndex]);. ... <看更多>