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我需要编写一些 JavaScript 功能来分析地址块并在此递送地址中的邮政编码在给定列表之一内时显示错误消息（例如，将受到奥运会的影响）。我使用 indexOf 将地址块的内容与受影响的邮政编码列表进行匹配，这很好用。

但是，出现问题是因为以 DW3 开头的不受影响的邮政编码将显示受影响的消息，因为 indexOf 正在获取 W3。正如您在下面的代码中看到的那样，我试图匹配邮政编码之前的空格，即“DW3”，但这根本不起作用，我不知道为什么。

也许正则表达式是匹配这种模式的更好方法，不幸的是我在正则表达式方面很糟糕，所以有人可以帮忙吗？

一个示例地址是：

<address>Mr Jim Smith<br>
    Flat, 4 Spring Lane<br>
    EASTLEIGH<br>
    DW3 6LS<br>
    United Kingdom</address>

这是JavaScript：

var AFFECTED_POSTCODES = ["DT1","DT10","DT11","DT2","DT3","DT4","DT5","DT6","DT8","DT9","E1","E10","E11","E13","E14","E15","E16","E18","E1W","E3","E6","E9","EC1A","EC2N","EC2R","EC2V","EC2Y","EC3M","EC3N","EC3R","EC3V","EC4","EC4M","EC4N","EC4R","EC4V","EC4Y","GU22","GU23","GU4","GU5","HA9","IG1","IG11","IG4","IG7","IG8","KT1","KT10","KT11","KT12","KT13","KT14","KT18","KT2","KT20","KT22","KT24","KT6","KT7","KT8","NW1","NW10","NW8","RH4","RH5","RM13","RM15","RM9","SE1","SE10","SE11","SE18","SE3","SE7","SL0","SL3","SW10","SW11","SW13","SW15","SW18","SW19","SW1A","SW1E","SW1H","SW1P","SW1V","SW1W","SW1X","SW1Y","SW3","SW5","SW6","SW7","SW8","TW1","TW10","TW11","TW19","TW5","TW6","TW7","TW8","TW9","UB3","UB7","W10","W11","W12","W14","W1B","W1C","W1G","W1H","W1J","W1K","W1T","W1U","W1W","W2","W3","W4","W5","W6","W7","W9","WC1A","WC1B","WC1E","WC1H","WC1N","WC1R","WC1V","WC2A","WC2B","WC2E","WC2N","WC2R"];
function checkPostcode(e){
    var isAffected = false,
        field = $('#delivery_details_wrapper address'),
        fieldText = $(field).text();
    for (var i=0; i<AFFECTED_POSTCODES.length; i++){
        var patt = ' ' + AFFECTED_POSTCODES[i];
        if (fieldText.indexOf(patt) !== -1) {
            isAffected = true;
        }
    }
    if (isAffected) {
        if ($('.warning').length === 0) {
            field.after('<p class="warning" style="margin-top: 10px; clear: both;">* Delivery to this postcode may be affected by the Olympics. For more info click <a href="'+ Arcadia.Loader.rootPath +'lib/html/olympic_message.html" class="lightbox" rel="lightbox({innerWidth: 600, innerHeight: 300})" title="Click here for postcodes that may be affected by the olympics">here</a></p>');
        }
    } else {
        $('.warning').remove();
    }
}
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1 回答 1

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正则表达式确实会更好，更简洁，更高效（表达式将编译为最佳匹配自动机）。这也很简单。

var alternation = AFFECTED_POSTCODES.join('|');
var r = new RegExp('\\b(' + alternation + ')\\b');
var isAffected = r.test(fieldText);

这里的\b手段匹配一个单词边界，这将处理你的子字符串问题。您甚至可以在正则表达式文字中写出邮政编码/\b(DT1|DT10...)\b/- 如果您在其他任何地方都不需要该数组。

于 2012-07-23T10:22:29.233 回答