javascript - 如何检查数组是否有键:value or not?

Question

  var people =[{title:'Alan', hasChild:true},
        {title:'Alice', hasDetail:true},
        {title:'Amos', header'A'},
        {title:'Alonzo'},
        {title:'Brad'},
        {title:'Brent'},    
        {title:'Billy'},    
        {title:'Brenda'},   
        {title:'Callie'},
        {title:'Cassie'},   
        {title:'Chris'}];

我想检查这个数组，它是否包含键、值header:value。我想检查每个元素。

Answer 1

应该这样做:

for (var i = 0, c = people.length;i < c;i++) {
    if (people[i].header) {
        // yay
        // not sure wether you want to check the value as well
        // but if that is the case, you'd do this
        if (people[i].header == 'A') {
            // do some more stuff
        }
    } else {
        // nay
    }
}