javascriptvara={data:[{title:'標(biāo)題1',index:0},{title:'標(biāo)題2',index:1},{title:'標(biāo)題3',index:2},{title:'標(biāo)題4',index:3}]};varb=a.data;varc=[];varcurrent=2;for(variinb){if(i!=current){c.push(b[i]);c[(c.length-1)].index=c.length-1;}}console.log(c);console.log(a);上面一段代碼里面為什么在對象a中標(biāo)題4對應(yīng)的index值變成了2另外，如果想不該變a的值應(yīng)該怎么做