='b'){/** * Get the substring of a string * @param {integer} start where to start the substring * @param {integer} length how many characters to return * @return {string} */String.prototype.substr=function(substr){returnfunction(start,length){// call the original methodreturnsubstr.cal...
1.substring 方法 定义和用法 substring 方法用于提取字符串中介于两个指定下标之间的字符。 语法 JavaScript代码 01.stringObject.substring(start,stop) 参数 描述 start 必需。一个非负的整数,规定要提取的子串的第一个字符在 stringObject 中的位置。 stop 可选。一个非负的整数,比要提取的子串的最后一个字符在...
Thesubstr()method does not change the original string. To extract characters from the end of the string, use a negative start position. Warning Thesubstr()method is removed (deprecated) in the latest JavaScript standard. Usesubstring()orslice()instead. ...
Let's look atsubstrandslicein detail. slice Note thatthis is different from theslicemethod in arraysbut works similarly. Syntax forslice string.slice(from,to); fromis the point (index position) which the cutting starts from in the string andtois the point where the cutting stops.But, unlike...
The slice() Method The substring() Method Syntax string.substr(start, length) Parameters Parameter Description start Required.The start position.First character is at index 0. If start is greater than the length, substr() returns "".If start is negative, substr() counts from the end of the...
The substr() method returns the characters in a string starting at a specified position and continuing for a specified number of characters. VersionImplemented in JavaScript 1.0 Syntaxsubstr(start_pos, length])Parameterstart_pos: Specifies the position in the string where to begin extracting ...
*/String.prototype.substr=function(substr) {returnfunction(start, length) {// call the original methodreturnsubstr.call(this,// did we get a negative start, calculate how much it is from the beginning of the string// adjust the start parameter for negative valuestart <0?this.length+ start...
JavaScript Substring before a Character: To get the substring before a character in Javascript we can use IndexOf() method and substring() or substr() method. For example in the below string to get substring before the character(say dash) i.e., Javascript ...
System.out.println("The method getCountBySplit consume " + (timeEnd - timeStart)); } public int getCountByChar(String source, String sub) { int count = 0; int pos = source.indexOf(sub.charAt(0)); do { next: if (pos > -1) { ...
Note, however, that this method has not been standardized by ECMAScript and is therefore deprecated. Example var s = "abcdefg"; s.substr(2,2); // Returns "cd" s.substr(3); // Returns "defg" s.substr(-3,2); // Should return "ef"; returns "ab" in IE 4 Bugs Negative values...