如何检查对象属性的值是否等于0？

Question

如何检查对象属性的任何值是否等于0？

Answer 1

You will have to iterate over the object keys, and check the value of each one:

for(var p in x) {
    if(x[p] === 0) {
        console.log("Found!");
    }
}

Depending on whether you care about properties that may have been inherited from the prototype , you could add a hasOwnProperty check in there:

for(var p in x) {
    if(x.hasOwnProperty(p)) {
        if(x[p] === 0) {
            //Found it!
        }
    }
}

Answer 2

I program in ActionScript, which is a similar dialect, so I am almost sure it will be the same. Please try:

if(arr[0] != null)

Note that there is a difference between arr[0] and arr["0"]