插入前:var arr = [
{
id:1,
name:"小明"
},
{
id:2,
name:"小红"
}]插入后:var arr = [
{
id:1,
name:"小明",
age:18
},
{
id:2,
name:"小红",
age:21
}]这个用js该怎么实现呀?
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