//数组浅拷贝
-> var oldArray = [0,1,2];
-> var newArray = oldArray.slice(0);
-> oldArray.pop();
<- [0,1]
-> newArray
<- [0,1,2]
//数组深拷贝
-> var oldArray = [{a:1},{b:2}];
-> var newArray = JSON.parse(JSON.stringify( oldArray ));
-> oldArray.pop();
<- [{a:1}]
-> newArray
<- [{a:1},{b:2}]
