我有这个数组:
var x = [1,2,3,4,5,"a","b","c",9,10];
我想将此数组切割为此模式:
var x = [[1,2,3],[2,3,4],[3,4,5],[4,5,"a"],[5,"a","b"],["a","b","c"],["b","c",9],["c",9,10]];
我使用了以下代码,并且能够获得[[1,2,3],[4,5,"a"],["b","c",9],[10,11,12]]
。但它对我不起作用。我需要得到上面的模式。
var stream = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
var x = ["a", "b", "c"];
var ad_time = 6;
var result = [];
var ad_index = stream.indexOf(ad_time);
if (~ad_index) {
for (var i = 0; i < x.length; i++) {
stream[ad_index + i] = x[i];
}
}
while (stream.length > 0) {
var chunk = stream.splice(0, 3);
result.push(chunk);
}
console.log(JSON.stringify(result));
感谢advence!
答案 0 :(得分:3)
此代码应该这样做:
var x = [1,2,3,4,5,"a","b","c",9,10];
var new_array = [];
for (var i = 0; i < x.length - 2; i++) {
new_array.push(x.slice(i, i + 3));
}
答案 1 :(得分:2)
您可以使用简单的for
循环来实现它:
var x = [1,2,3,4,5,"a","b","c",9,10];
var result = [];
for (var i = 0, il = x.length - 2; i < il; i++) {
result.push([x[i], x[i + 1], x[i + 2]]);
}
console.log(result);
编辑: Array.slice()
更优雅,但速度要慢得多。根据{{3}}测试,在Chrome上它的速度要慢80% - 85%。如果您不需要担心性能,请选择您喜欢的。例如,如果您需要从数组中切割8个元素,那么使用x.slice(i + 8)
比[x[i], x[i + 1], x[i + 2], x[i + 3], ...]
更容易编写和读取。但是,如果性能很重要,那么直接访问可能是更好的选择。