Question

我需要编写一些分析地址块并显示错误的JavaScript功能如果此递送地址中的邮政编码在给定列表中的一个内（例如，将受到影响，则显示消息）奥林匹克）。我使用indexOf来匹配列表中的地址块的内容受影响的邮政编码，这很好。

然而问题出现是因为以DW3开头的邮政编码不会受到影响显示受影响的消息，因为indexOf正在拾取W3。正如你在我看到的那样下面的代码我试图匹配邮政编码之前的空格即“DW3”，但这根本不起作用，我不明白为什么。

遗憾的是，正则表达式可能是匹配此模式的更好方法我在正则表达式上很糟糕，所以任何人都可以帮忙吗？

示例地址为：

<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();
    }
}

Answer 1

正则表达式确实会更好，更简洁，更有效（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);

此处\b表示匹配单词边界，这将处理您的子字符串问题。您甚至可以在正则表达式文字中写出邮政编码 - /\b(DT1|DT10...)\b/ - 如果您不需要其他地方的数组。

使用indexOf或regex匹配邮政编码的开头？

1 个答案: