js.拼接返回已删除的项目? [英] js. splice returns removed item?

问题描述

我在理解接头时遇到问题，我想寻求帮助.

I am having problem of understanding splice and I want to have help.

请检查jsfiddle.

Please check the jsfiddle.

http://jsfiddle.net/fantill/TbpWf/1/

value = "c, a, b"
value = value.split(',').splice(1, 1).join(',')
alert(value);

该值应该返回'c, b'.

但是，它返回'a';

此方法有什么问题?

非常感谢您.

推荐答案

.splice 确实返回已删除的项目.但是，它也会在内部操作数组.这样可以防止您将任何内容链接到.splice.您必须进行两个单独的调用:

.splice does return the removed item. However, it also manipulates the array internally. This prevents you from chaining anything to .splice; you must do two separate calls:

value = value.split(',');
value.splice(1, 1);
console.log(value.join(','));

如果执行value = value.splice(...)，则value被覆盖，并且数组丢失！

If you do value = value.splice(...), value is overridden, and the array is lost!

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