代码语言:javascript 代码运行次数:0 运行 AI代码解释 // only run when the substr() function is brokenif('ab'.substr(-1)!='b'){/** * Get the substring of a string * @param {integer} start where to start the substring * @param {integer} length how many characters to return * @retu...
function safeSubstring(str, startIndex, endIndex) { if (startIndex > endIndex) { [startIndex, endIndex] = [endIndex, startIndex]; } return str.substring(startIndex, endIndex); } let result = safeSubstring("Hello, World!", 7, 2); console.log(result); // 输出: llo ...
Extracting a portion of a string is a fairly well understood practice. With JavaScript, there are three different built-in functions which can perform that operation. Because of this, often it is very confusing for beginners as to which function should be used. Even worse, sometimes it is eas...
方法一:用charAt取出截取部分: String.prototype.mysubstring=function(beginIndex,endIndex){ var str=this, newArr=[]; if(!endIndex){ endIndex=str.length; } for(var i=beginIndex;i<endIndex;i++){ newArr.push(str.charAt(i)); } return newArr.join(""); } //test "Hello world!".mysubstr...
function SubstrDemo(){ var s, ss; // 声明变量。 var s = "The rain in Spain falls mainly in the plain."; ss = s.substr(12, 5); // 获取子字符串。 return(ss); // 返回 "Spain"。 } substring 方法 返回位于 String 对象中指定位置的子字符串。
function SubstringDemo(){ var ss; // 声明变量。 var s = "The rain in Spain falls mainly in the plain.."; ss = s.substring(12, 17); // 取子字符串。 return(ss); // 返回子字符串。 }复制代码 1. 2. 3. 4. 5. 6. 拓展阅读: js中取小数整数部分函数 ...
To summarize, thereplace()method is a built-in function in JavaScript that is used to replace all occurrences of a specified substring within a string with another substring or value. It takes two parameters:searchValueandreplaceValue. ThesearchValueparameter can be either a string or a regular ...
function SubstrDemo() var s, ss; / 声明变量。 var s = The rain in Spain falls mainly in the plain.; ss = s.substr(12, 5); / 猎取子字符串。 return(ss); / 返回 Spain。 举例: script type=text/javascript var str = 0123456789;/ alert(str.substring(0);/-0123456789 3、 alert(str...
function SubstrDemo(){ var s, ss; // 声明变量。 var s = "The rain in Spain falls mainly in the plain."; ss = s.substr(12, 5); // 获取子字符串。 return(ss); // 返回 "Spain"。 } substring 方法 返回位于 String 对象中指定位置的子字符串。
JavaScript String Methods JavaScript String Search Browser Support substring()is an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers: ChromeEdgeFirefoxSafariOperaIE YesYesYesYesYesYes ❮PreviousJavaScript StringReferenceNext❯ ...