javascript中FOREACH数组方法使用示例
Array.prototype.forEach()方法让数组的每一项都执行一次给定的函数。—MDN
假设有这么一个场景，你拿到了这么一个数组
[
{symbol:"XFX",price:240.22,volume:23432},
{symbol:"TNZ",price:332.19,volume:234},
{symbol:"JXJ",price:120.22,volume:5323},
]
你需要为其中的symbol创建一个新数组,也就是
["XFX","TNZ","JXJ"]
一般可以用for循环实现：
functiongetStockSymbols(stocks){
varsymbols=[],
stock,
i;
for(i=0;i<stocks.length;i++){
stock=stocks[i];
symbols.push(stock.symbol);
}
returnsymbols;
}
varsymbols=getStockSymbols([
{symbol:"XFX",price:240.22,volume:23432},
{symbol:"TNZ",price:332.19,volume:234},
{symbol:"JXJ",price:120.22,volume:5323},
]);
输出："[/"XFX/","TNZ/","JXJ/"]"
你也可以采用Array的forEach方法来简化代码，它们的输出是完全一样的。
functiongetStockSymbols(stocks){
varsymbols=[];
stocks.forEach(function(stock){
symbols.push(stock.symbol);
});
returnsymbols;
}