// 使用includes()方法判断mainString是否包含subStringletcontains=mainString.includes(subString); 1. 2. includes()方法会返回一个布尔值,表示mainString是否包含subString。如果包含,contains将为true;否则为false。 3. 输出结果 最后,我们可以根据判断的结果输出相应的信息。 // 输出判断结果if(contains){console.l...
To check if a Javascript String Contains a substring or not, we can use 7 different Javascript methods as listed in below table.
* / function contains(string, substr, isIgnoreCase) { if (isIgnoreCase) { string = string.toLowerCase(); substr = substr.toLowerCase(); } var startChar = substr.substring(0, 1); var strLen = substr.length; for (var j = 0; j<string.length - strLen + 1; j++) { if (string.c...
JavaScript实现字符串的contains函数/ * * string:原始字符串 * substr:⼦字符串 * isIgnoreCase:忽略⼤⼩写 * / function contains(string, substr, isIgnoreCase){ if (isIgnoreCase){ string = string.toLowerCase();substr = substr.toLowerCase();} var startChar = substr.substring(0, 1);var ...
if (parsed) alert("Your email address contains all valid characters."); // Stop hiding --> </SCRIPT> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. substring()函数: 这个函数通常使用于提取字符串的任何部分。它的参数是'start' 和'end'。开始的数值是第一个字符的索引,...
How do you check if one string contains a substring in JavaScript?Craig Buckler
constmainString="这是一个测试字符串";constsubString="测试";if(mainString.includes(subString)){console.log("子字符串存在");}else{console.log("子字符串不存在");} 在这个示例中,mainString是要检查的字符串,subString是要查找的子字符串。includes()方法检查mainString是否包含subString,如果包含...
string:要匹配的字符串 substr:子字符串 isIgnoreCase:是否忽略大小写 function contains(string, substr, isIgnoreCase) { if (isIgnoreCase) { string = string.toLowerCase(); substr = substr.toLowerCase(); } var startChar = substr.substring(0, 1); ...
var string = "foo", expr = /oo/; string.match(expr); Performance testsare showing thatindexOfmight be the best choice, if it comes to a point where speed matters. 来源:https://stackoverflow.com/questions/1789945/how-to-check-whether-a-string-contains-a-substring-in-javascript...
},contains: function( what ) {/** * Returns boolean indicating whether * or not a substring exists within the string **/what = typeof what === 'string' ? what : what.toString();return this.indexOf( what ) > -1;},count: function( what ) {/**...