javascript 检查字符串是否存在于另一个字符串的最佳方法是什么？
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what is the best way to check if a string exists in another?
提问by The Mask
Possible Duplicate:
JavaScript: string contains
可能重复：
JavaScript：字符串包含
I'm looking for an algorithm to check if a string exists in another.
我正在寻找一种算法来检查一个字符串是否存在于另一个字符串中。
For example:
例如：
'Hello, my name is jonh LOL.'.contains('Hello, my name is jonh'); //true
'LOL. Hello, my name is jonh'.contains('Hello, my name is jonh'); //true
Thanks in advance.
提前致谢。
采纳答案by Digital Plane
Use indexOf:
使用indexOf：
'Hello, my name is jonh LOL.'.indexOf('Hello, my name is jonh') > -1; //true
'LOL. Hello, my name is jonh'.indexOf('Hello, my name is jonh') > -1; //true
You can also extend String.prototypeto have a containsfunction:
您还可以扩展String.prototype以拥有一个contains功能：
String.prototype.contains = function(substr) {
return this.indexOf(substr) > -1;
}
'Hello, my name is jonh LOL.'.contains('Hello, my name is jonh'); //true
'LOL. Hello, my name is jonh'.contains('Hello, my name is jonh'); //true
回答by JaredPar
As Digital pointed out the indexOfmethod is the way to check. If you want a more declarative name like containsthen you can add it to the Stringprototype.
正如 Digital 指出的那样，indexOf方法是检查的方法。如果你想要一个更具声明性的名称，contains那么你可以将它添加到String原型中。
String.prototype.contains = function(toCheck) {
return this.indexOf(toCheck) >= 0;
}
After that your original code sample will work as written
之后，您的原始代码示例将按编写的方式工作
回答by Joe
How about going to obscurity:
去默默无闻怎么样：
!!~'Hello, my name is jonh LOL.'.indexOf('Hello, my name is jonh'); //true
if(~'LOL. Hello, my name is jonh'.indexOf('Hello, my name is jonh'))
alert(true);
Using Bitwise NOT and to boolean NOTs to convert it to a boolean than convert it back.
使用按位非和布尔非将其转换为布尔值而不是将其转换回来。
回答by clarkb86
I would suppose that using pre-compiled Perl-based regular expression would be pretty efficient.
我认为使用预编译的基于 Perl 的正则表达式会非常有效。
RegEx rx = new Regex('Hello, my name is jonh', RegexOptions.Compiled);
rx.IsMatch('Hello, my name is jonh LOL.'); // true
回答by marcelog
another option could be to match a regular expression by using match(): http://www.w3schools.com/jsref/jsref_match.asp.
另一种选择是使用 match() 匹配正则表达式：http: //www.w3schools.com/jsref/jsref_match.asp。
> var foo = "foo";
> console.log(foo.match(/bar/));
null
> console.log(foo.match(/foo/));
[ 'foo', index: 0, input: 'foo' ]
