var arr =[{name:'tom'},{name:'john'},{name:'jim'}];
arr.forEach((item)=>{
if(item.name==="john"){
item={name:'aaa'}
}
});
var arr =[{name:'tom'},{name:'john'},{name:'jim'}];
arr.forEach((item)=>{
if(item.name==="john"){
item={name:'aaa'}
}
});
本文标题：js for循环不能直接改变当前项
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