如何检查所有对象键是否都具有假值 [英] how to check if all object keys has false values

问题描述

JS对象:

var saver = {
        title: false,
        preview: false,
        body: false,
        bottom: false,
        locale: false
};

问题是如何检查所有值是否都是 false ?

The question is how to check if all values is false?

我可以使用$ .each()jQuery函数和一些标志变量，但是可能有更好的解决方案?

I can use $.each() jQuery function and some flag variable, but there may be a better solution?

推荐答案

这可以解决问题...

This will do the trick...

var result = true;

for (var i in saver) {
    if (saver[i] === true) {
        result = false;
        break;
    }
}

您可以通过索引或键(如上所述)使用循环来迭代对象.

You can iterate objects using a loop, either by index or key (as above).

如果您使用的是整洁的代码，并且不重复，则只需将其放入函数中即可.

If you're after tidy code, and not repeating that then simply put it in a function...

Object.prototype.allFalse = function() { 
    for (var i in this) {
        if (this[i] === true) return false;
    }
    return true;
}

然后您可以在需要时调用它，就像这样...

Then you can call it whenever you need, like this...

alert(saver.allFalse());

这是一个有效的示例...

Here's a working sample...

Object.prototype.allFalse = function() { 
    for (var i in this) {
        if (this[i] === true) return false;
    }
    return true;
}

var saver = {
        title: false,
        preview: false,
        body: false,
        bottom: false,
        locale: false
};

console.log("all are false - should alert 'true'");
console.log(saver.allFalse());

saver.body = true;

console.log("one is now true - should alert 'false'");
console.log(saver.allFalse());

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