跳过FOR循环中的多个元素，Javascript [英] Skipping multiple elements in a FOR loop, Javascript

问题描述

我想使用javascript函数将某些文件内容传递给服务器.在文件中，有许多空行或包含无用文本的行.到目前为止，我以存储在数组中的字符串的形式读取每一行.

I have some file contents I'd like to pass on to my server using a javascript function. In the file, there are many empty lines, or those which contain useless text. So far I read every line in as a string stored in an array.

然后我该如何跳过该行，从而跳过多行，例如行24、25、36、42、125等.我可以将这些元素ID放入数组中并告诉我的for循环在除这些元素之外的所有元素上运行吗?

How do I then loop through that content skipping multiple lines such as lines 24,25, 36, 42, 125 etc. Can I put these element id's into an array and tell my for loop to run on every element except these?

谢谢

推荐答案

您不能让for循环重复所有操作，而是跳过某些元素.它基本上只会在任何方向上(简化)计数，直到满足特定条件为止.

you can't tell your for loop to iterate all, but skip certain elements. it will basically just count in any direction (simplified) until a certain critera has been met.

但是，您可以将if放入循环中以检查某些条件，如果满足条件，则不执行任何操作.例如:

you can however put an if inside your loop to check for certain conditions, and chose to do nothing, if the condition is met. e.g.:

(下面的伪代码，请小心输入错误)

(pseudo code below, beware of typing errors)

for(var line=0; line < fileContents.length; line++) { 
    if(isUselessLine(line)) { 
        continue; 
    }
    // process that line
}

continue关键字基本上告诉for循环跳过"当前迭代的其余部分，并继续下一个值.

the continue keyword basically tells the for loop to "jump over" the rest of the current iteration and continue with the next value.

如果具有给定行号的行对您无用，则isUselessLine函数必须以某种方式自己实现，该函数将返回true.

The isUselessLine function is something you'll have to implement yourself, in a way, that it returns true, if the line with the given linenumber is useless for you.

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