replace() 方法用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //replace(substr, replacetext) var myString = '999 JavaScript Coders'; console.log(myString.replace(/JavaScript
Here,stris a string. replace() Parameter Thereplace()method takes in: pattern- either a string or a regex that is to be replaced replacement- thepatternis replaced with thisreplacement(can be either a string or a function) relace() Return Value ...
varstr=newString("abc");//通过访问字符串的 length(编码单元的个数)属性,可以得到它的长度。"hello".length;// 5//字符串也有 methods(方法)能让你操作字符串和获取字符串的信息。"hello".charAt(0);// "h" charAt(下标)"hello, world".replace("world","mars");// "hello, mars""hello".toUpper...
第一次发现JavaScript中replace() 方法如果直接用str.replace("-","!") 只会替换第一个匹配的字符. 而str.replace(/\-/g,"!")则可以全部替换掉匹配的字符(g为全局标志)。 replace() The replace() method returns the string that results when you replace text matching its first argument (a regular ...
= 'string' 判断rplStr的值类型是不是一个字符串46//为什么要这么判断呢,47//var rplStr = RplJson[b]; 参数b作为key在RplJson中可能是不存在的,不存在,取出来的值肯定不是string类型了48//如果key存在则返回RplJson对象中key对应的value,否则则不进行替换,返回原始字符串49returntypeof(rplStr)=='string...
Thereplace()method does not change the original string. Note If you replace a value, only the first instance will be replaced. To replace all instances, use a regular expression with the g modifier set. Read more about regular expressions in our: ...
可以使用String作为toString()更可靠的代替方法,因为它在用于null和undefined时仍然有效。例如: js constnullVar=null;nullVar.toString();// TypeError: nullVar is nullString(nullVar);// "null"constundefinedVar=undefined;undefinedVar.toString();// TypeError: undefinedVar is undefinedString(undefinedVar);/...
In JavaScript, the syntax for the replace() method is: string.replace(search_expression, replacement); Parameters or Arguments search_expression It is either a string value or a RegExp object that will be searched for in string. As a RegExp object, it can be a combination of the following...
String trimEnd() String padStart() String padEnd() String repeat() String replace() String replaceAll() String split() JavaScript String Length Thelengthproperty returns the length of a string: Example lettext ="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; ...
replace()方法用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串。 //replace(substr, replacetext)varmyString ='999 JavaScript Coders';console.log(myString.replace(/JavaScript/i,"jQuery"));//output: 999 jQuery Coders//replace(regexp,...