我正在尝试将值推送到数组,但这会将值添加到两个数组a和b.如何确保b不修改数组？
var a=[[1]];
var b= [2];
document.getElementById("1").innerHTML="a[1] "+a[1];
document.getElementById("2").innerHTML="b "+b;
a.push(b);
document.getElementById("3").innerHTML="a[1] "+a[1];
document.getElementById("4").innerHTML="b "+b;
a[1].push([3]);
document.getElementById("5").innerHTML="a[1] "+a[1];
document.getElementById("6").innerHTML="b "+b+" < why did this value changed?";<div id="1"></div>
<div id="2"></div><br />
<div id="3"></div>
<div id="4"></div><br />
<div id="5"></div>
<div id="6"></div><br />