javascript - 比较数组与嵌套循环

Question

我正在尝试比较两个数组的值。如果找到匹配项 - 执行某些操作 - 否则执行此操作。

我用我的代码在 http://jsfiddle.net/ZvmHx/1/ 上整理了一个 fiddle 。

如果您取消第 14 行第二个警报的注释，您将看到问题所在。我似乎无法阻止第二个警报的触发。

谢谢!

var getkeywords = ["John","Frank","Sarah"]; 
var captionarray = ["Jim","Joe","Lee","Steve","John","Michelle","Brad"];    

for (k = 0; k < getkeywords.length; k++) {
    for (l = 0; l < captionarray.length; l++) {

    if(getkeywords[k] == captionarray[l]){

        alert('Found > ' + getkeywords[k] + ':filter image');

    }else{

        //alert('not found > ' + getkeywords[k] + ':filter image');

    }
  }
}

Answer 1

正在为内部循环的每次迭代测试 if/else。我认为您要做的是测试内部循环运行后是否有匹配。像这样的东西:

var getkeywords = ["John","Frank","Sarah"]; 
var captionarray = ["Jim","Joe","Lee","Steve","John","Michelle","Brad"];    
var matchFound;

for (k = 0; k < getkeywords.length; k++) {
    matchFound = false;

    for (l = 0; l < captionarray.length; l++) {
        if (getkeywords[k] == captionarray[l]){
            matchFound = true;
            break;
        }
    }

    if(matchFound){

        alert('Found > ' + getkeywords[k] + ':filter image');

    }else{

        alert('not found > ' + getkeywords[k] + ':filter image');

    }
}