有没有办法在javascript中找出某个字符串在数组中的次数？

Question

I have an array that I want to find the number of string 'hello' in it. Is there any way to do this?

Answer 1

var count = 0;
for(var i=0; i<myArray.length; i++) {
    if(myArray[i] == 'hello') {
        count++;
    }
}

Answer 2

Assuming it's an array of strings,

var count = 0;
for (var i = 0; i < stringArray.length; ++i) {
  if (stringArray[i] == "hello")
    ++count;
}

Answer 3

现在，对于功能完全 不同的 东西：

var count = stringArray.filter(function(x) { return x == "hello" }).length

Answer 4

var arr=['no','hello',2,true,false,'hello','true','hello'];
if(arr.indexOf){
    var ax= -1, count= 0;
    while((ax= arr.indexOf('hello', ax+1))!= -1)++count;
}
alert(count)

Answer 5

要么

var count = stringArray.reduce(function(a,b){ return (b=='hello')?a+1:a},0)