Javascript 循环中的空字符串或空检查
如何改进上述代码?我写了一个循环,但在数组中得到了unfined1,unfined2,unfined3,unfined4的值Javascript 循环中的空字符串或空检查,javascript,node.js,express,Javascript,Node.js,Express,如何改进上述代码?我写了一个循环,但在数组中得到了unfined1,unfined2,unfined3,unfined4的值 var imageArr = []; if(req.body.photo1){ imageArr.push(req.body.photo1); } if(req.body.photo2){ imageArr.push(req.body.photo2); } if(req.body.photo3){ imageArr.push(req.body.photo3);
var imageArr = [];
if(req.body.photo1){
imageArr.push(req.body.photo1);
}
if(req.body.photo2){
imageArr.push(req.body.photo2);
}
if(req.body.photo3){
imageArr.push(req.body.photo3);
}
if(req.body.photo4){
imageArr.push(req.body.photo4);
}
for(var i=1;i由于“photo”+i
是一个变量键,您需要作为req.body[“photo”+1]
for(var i = 1; i<=4;i++){
if(req.body.photo+''+i){
imageArr.push(req.body.photo+''+i);
}
}
for(变量i=1;iis是否将其分配给值
变量?
for(var i = 1; i<=4;i++)
{
var value = req.body[ "photo"+ i];
if( value )
{
imageArr.push(value);
}
}