如何检查是否文本几乎是必需的

Question

我想，要检查我的textarea的价值几乎是一样的，需要例如相同：

我有一个HTML代码：

<textarea class="ab" placeholder="Type here"></textarea> 
<div class="result"> 
</div> 

和jQuery代码：

$(document).ready(function(){ 

    $(".btn").click(function(){ 
    var a = $(".ab").val(); 
    var b = $(".result").html(); 
    /* */ 



if(a.indexOf('Which of the following is generally true about Open Source software?') >= 0){$('.result').html('Its usually developed on a volunteer basis and anyone is free to change it (correct).');} /* */ 
    else{ 
     $(".result").html("error"); 

    } 
    }); 

}); 

此代码不起作用正如我真正想要的，这正是我试图使。但我想的东西是例如当$('.ab')的值几乎一样的文字Which of the following is generally true about Open Source software?像the following is generally true或true about the Open Source，在$(".result")仍然有HTML作为Its usually developed on a volunteer basis and anyone is free to change it (correct).

让我怎么做，谢谢您的帮助

Answer 1

其实应该是：

$(document).ready(function(){ 
     $(".btn").click(function(){ 
      var a = $(".ab").val(); 
      var b = $(".result").html(); 
      var c = 'Which of the following is generally true about Open Source software?'; 
      console.log(c.indexOf(a)); 
      if(c.indexOf(a) >= 0){ 
       $('.result').html('Its usually developed on a volunteer basis and anyone is free to change it (correct).'); 
      } else { 
       $(".result").html("error"); 
      } 
     }); 

    }); 

<textarea class="ab" placeholder="Type here">following is generally true about Open Source</textarea> 
<div class="result"></div> 
<button class="btn">test</button> 

Answer 2

尝试将输入文本分割成数组，使用$.each()迭代输入字，如果输入的字匹配所选短语中的至少五个单词，则返回true，否则在if处返回false;例如。;请尝试输入或粘贴在textarea

the following is generally true或true about the Open Source

$(document).ready(function() { 
 

 
    $(".btn").click(function() { 
 
    var a = $(".ab"); 
 
    var b = $(".result"); 
 
    var arr = a.val().split(/\s+/); 
 
    var n = 0; 
 
    var phrase = "Which of the following is generally true about Open Source software?"; 
 
    $.each(arr, function(key, val) { 
 
     if(phrase.indexOf(val) >= 0) ++n; 
 
    }) 
 
    
 
    if (n >= 5) { 
 
    b.html('Its usually developed on a volunteer basis and anyone is free to change it (correct).'); 
 
    } 
 
    else { 
 
     b.html("error"); 
 
    }; 
 
    a.val(""); n = 0; 
 
    }); 
 

 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> 
 

 
<textarea class="ab" placeholder="Type here"></textarea> 
 
<div class="result"></div> 
 
<button class="btn">click</button>