03.使用函数

 

var names=["Fred","Wilma","Pebbles"];
var upper=names.map(function(name){
    return name.toUpperCase();
});
upper;//["FRED", "WILMA", "PEBBLES"]

var alphabet="";
for(var i=0;i<26;i++){
    alphabet+=String.fromCharCode(aIndex+i);
}
alphabet;//"abcdefghijklmnopqrstuvwxyz"

function buildString(n,callback){
    var result="";
    for(var i=0;i<n;i++){
        result +=callback(i);
    }
    return result;
}

var alphabet=buildString(26,function(i){
    return String.fromCharCode(aIndex+i);
});
alphabet;//"abcdefghijklmnopqrstuvwxyz"

var digits=buildString(10,function(i){return i;})
digits;//"0123456789";

var random=buildString(8,function(){
    return String.fromCharCode(Math.floor(Math.random()*26)+aIndex);
});
random;//"awhxtbao"

 

        var table = {
            entries: [],
            addEntry: function (key, value) {
                this.entries.push({ key: key, value: value });
            },
            forEach: function (f, thisArg) {
                var entries = this.entries;
                for (var i = 0, n = entries.length; i < n; i++) {
                    var entry = entries[i];
                    f.call(thisArg, entry.key, entry.value, i);
                }
            }
        }