问题描述
当我创建一个新的JavaScript数组并使用整数作为键时,该数组中直到该整数为止的每个元素都会被创建为undefined.
When I create a new JavaScript array, and use an integer as a key, each element of that array up to the integer is created as undefined.
例如:
var test = new Array();
test[2300] = 'Some string';
console.log(test);
将输出2298个未定义的和一个某些字符串".
will output 2298 undefined's and one 'Some string'.
我应该如何让JavaScript使用2300作为字符串而不是整数,或者应该如何避免实例化2299空索引?
How should I get JavaScript to use 2300 as a string instead of an integer, or how should I keep it from instantiating 2299 empty indices?
推荐答案
使用对象.但是,请注意,您不可以具有整数键. JavaScript将将整数转换为字符串.以下输出20,不是未定义的:
Use an object, as people are saying. However, note that you can not have integer keys. JavaScript will convert the integer to a string. The following outputs 20, not undefined:
var test = {}
test[2300] = 20;
console.log(test["2300"]);
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