substring() Parameters Thesubstring()method takes in: indexStart- The index of the first character to start including in the returned substring. indexEnd(optional) - The index before which to stop extraction. (Exclusive) If omitted, it extracts till the end of the string. Notes: Anyargument ...
var textbox = document.forms[0].elements["firstText"];EventUtil.addHandler(textbox,"select",function (event) {if (typeof textbox.selectionStart == "number"){ alert(textbox.value.substring(textbox.selectionStart,textbox.selectionEnd)); } else if (document.selection){ alert(document.s...
var string = "55+5"; // Just a variable for your input. function getBeforePlus(str){ return str.substring(0, str.indexOf("+")); /* This gets a substring from the beginning of the string to the first index of the character "+". */ } 否则,我建议使用 String.split() 方法。 ...
/// /// 返回定长的字符串，如果发生截取，在后面补充两个或三个"." /// Author:jetz...
The "subStrAfterChars()" function takes three parameters: 'str' (the input string), 'char' (the character to search for), and 'pos' (the position indicator). Inside the function, it checks the value of the 'pos 'parameter: If 'pos' is 'b' (before), it returns the substring after...
function getSelectText(text) { if (typeof text.selectionStart == 'number') {//非IE return text.value.substring(text.selectionStart, text.selectionEnd); } else if (document.selection) {//IE return document.selection.createRange().text;//获取IE选择的文本 ...
1functiongetSelectText(text) {23if(typeoftext.selectionStart == 'number') {//非IE45returntext.value.substring(text.selectionStart, text.selectionEnd);67}elseif(document.selection) {//IE89returndocument.selection.createRange().text;//获取IE选择的文本1011}1213} ...
},next() {// This makes us an iteratorletstart = r.lastIndex;// Resume where the last match endedif(start < s.length) {// If we're not doneletmatch = r.exec(s);// Match the next word boundaryif(match) {// If we found one, return the wordreturn{value: s.substring(start,...
function getSelectedText(textbox) { if (typeof textbox.selectionStart == "number") { return textbox.value.substring(textbox.selectionStart, textbox.selectionEnd); } else if (document.selection) { return document.selection.createRange().text; ...
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 string. length Opt...