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; }