When pushing an array's contents to another array I get
"未捕获的TypeError:无法读取未定义的属性‘Push’"错误 在这个片段中.
var order = new Object(), stack = [];
for(var i=0;i<a.length;i++){
if(parseInt(a[i].daysleft) == 0){ order[0].push(a[i]); }
if(parseInt(a[i].daysleft) > 0){ order[1].push(a[i]); }
if(parseInt(a[i].daysleft) < 0){ order[2].push(a[i]); }
}
为什么在第二个if语句中会出现这个错误？
You get the error because order[1] is undefined.
该错误消息意味着在代码中的某个地方，试图访问具有某个名称的属性(这里是"push")，但引用的基数实际上是undefined，而不是对象.因此，要找到问题，您需要查找引用该属性名称("push")的代码，并查看其左边是什么.在本例中，代码是
if(parseInt(a[i].daysleft) > 0){ order[1].push(a[i]); }
which means that the code expects order[1] to be an array. It is, however, not an array; it's undefined, so you get the error. Why is it undefined? Well, your code doesn't do anything to make it anything else, based on what's in your question.
现在，如果您只想在对象的特定属性中放置a[i]，那么根本不需要调用.push():
var order = [], stack = [];
for(var i=0;i<a.length;i++){
if(parseInt(a[i].daysleft) == 0){ order[0] = a[i]; }
if(parseInt(a[i].daysleft) > 0){ order[1] = a[i]; }
if(parseInt(a[i].daysleft) < 0){ order[2] = a[i]; }
}