Question

我想读取插入到textarea中的行并返回值大于0.0的行 - 这是我输入textarea的行的示例：

error: there were errors found during runtime 12.0
warning: incorrect info 1.0
warning: file at 'C://localhost/myfiles' not found 0.0
warning: file at 'C://localhost/css' not found 0.0
warning: file at 'C://localhost/js' not found 0.0
warning: file at 'C://localhost/assets' not found 5615612.0

这些将是线条的例子应该返回的值是因为最后的数字大于0.0

error: there were errors found during runtime 12.0
warning: incorrect info 1.0
warning: file at 'C://localhost/assets' not found 5615612.0

每行的代码

foreach(explode("\n", $text) as $line) {
    //read line
}

，并尝试使用Javascript

var lines = $('textarea').val().split('\n');
for(var i = 0;i < lines.length;i++){
    //code here using lines[i] which will give each line but how do I look
    //for the last numbers to make sure that the numbers are grater than 0.0
}

Answer 1

在javascript中，您可以从一个过滤行

的函数开始

var endsAboveZero = function(line) {
    var words = lines.split(/\s/);
    var last = words[words.length - 1];
    return parseFloat(last) > 0;
};

然后您可以根据此过滤您的行。如果您可以使用Array.filter：

，那就是一个班轮

var lines = $('textarea').val().split('\n');
var goodLines = lines.filter(endsAboveZero);

或者，使用for循环：

var lines = $('textarea').val().split('\n');
var goodLines = [];
for (var i = 0; i < lines.length; i++) {
    if (endsAboveZero(lines[i])) {
        goodLines.push(lines[i]);
    }
}

如果textarea中存在奇数输入，您可能需要添加一些错误检查。

Answer 2

使用Xufox建议的过滤器（检查为null，因为它会导致错误“无法读取null的属性'0'）

function getLines()
{
  return $("textarea").val().split("\n").filter(line => line.match(/\d+\.\d+$/) != null && Number(line.match(/\d+\.\d+$/)[0]) > 0);
}
      
$(document).ready(
  function(){
     $('#printlogs').html(getLines().join('<br>'));
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea style="width:100%;height:120px">
error: there were errors found during runtime 12.0
warning: incorrect info 1.0
warning: file at 'C://localhost/myfiles' not found 0.0
warning: file at 'C://localhost/css' not found 0.0
warning: file at 'C://localhost/js' not found 0.0
warning: file at 'C://localhost/assets' not found 5615612.0
</textarea>

<h4>Error Log</h4>
<printlogs id="printlogs"></printlogs>

如何逐行读取并仅返回数字大于0.0的行

2 个答案: