Javascript 中 indexOf 的替代方案
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alternative to indexOf in Javascript
提问by Fahim Parkar
I have string as this is test for alternative. What I want to find is location of for. I know I could have done this using alert(myString.indexOf("for")), however I don't want to use indexOf.
我有字符串作为this is test for alternative. 我想找到的是for. 我知道我可以使用 完成此操作alert(myString.indexOf("for"))，但是我不想使用indexOf.
Any idea/ suggestion for alternative?
任何想法/建议替代？
jsfiddle
提琴手
Again, I need this done by Javascriptonly. No jQuery.. sadly :(
同样，我只需要通过Javascript来完成。没有 jQuery .. 可悲的是 :(
回答by Barak
.search()?
"this is test for alternative".search("for")
>> 13
回答by koopajah
You could code your own indexOf ? You loop on the source string and on each character you check if it could be your searched word.
您可以编写自己的 indexOf 吗？您在源字符串和每个字符上循环，检查它是否可能是您搜索的单词。
An untested version to give you an idea:
一个未经测试的版本给你一个想法：
function myIndexOf(myString, word) {
var len = myString.length;
var wordLen = word.length;
for(var i = 0; i < len; i++) {
var j = 0;
for(j = 0; j < wordLen; j++) {
if(myString[i+j] != word[j]) {
break;
}
}
if(j == wordLen) {
return i;
}
}
return -1;
}
