需要javascript代码背后的逻辑
我正在浏览一些javascript和jQuery示例,以及一些我在下面遇到的代码,但我不能完全理解。我想知道它试图验证的条件是什么需要javascript代码背后的逻辑,javascript,jquery,Javascript,Jquery,我正在浏览一些javascript和jQuery示例,以及一些我在下面遇到的代码,但我不能完全理解。我想知道它试图验证的条件是什么 function checkPostCode(toCheck) { var alpha1 = "[abcdefghijklmnoprstuwyz]"; // Character 1 var alpha2 = "[abcdefghklmnopqrstuvwxy]"; //
function checkPostCode(toCheck)
{
var alpha1 = "[abcdefghijklmnoprstuwyz]"; // Character 1
var alpha2 = "[abcdefghklmnopqrstuvwxy]"; // Character 2
var alpha3 = "[abcdefghjkpmnrstuvwxy]"; // Character 3
var alpha4 = "[abehmnprvwxy]"; // Character 4
var alpha5 = "[abdefghjlnpqrstuwxyz]"; // Character 5
var pcexp = new Array ();
pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "{1}" + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
pcexp.push (/^(GIR)(\s*)(0AA)$/i);
pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
pcexp.push (/^([A-Z]{4})(\s*)(1ZZ)$/i);
var postCode = toCheck;
var valid = false;
for ( var i=0; i<pcexp.length; i++) {
if (pcexp[i].test(postCode)) {
pcexp[i].exec(postCode);
postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
postCode = postCode.replace (/C\/O\s*/,"c/o ");
valid = true;
break;
}
}
if (valid) {return postCode;} else return false;
}
功能检查邮政编码(toCheck)
{
var alpha1=“[abcdefghijklmnoprstuwyz]”;//字符1
var alpha2=“[abcdefghklmnopqrstuvxy]”;//字符2
var alpha3=“[abcdefghjkpmnrstuvwxy]”;//字符3
var alpha4=“[abehmnpvwxy]”;//字符4
var alpha5=“[abdefghjlnpqrstuwxyz]”;//字符5
var pcexp=新数组();
pcexp.push(新的RegExp(“^(“+alpha1+”{1}“+alpha2+”?[0-9]{1,2}”)(\\s*)([0-9]{1}“+alpha5+”{2})$,“i”);
pcexp.push(新的RegExp(“^(“+alpha1+”{1}[0-9]{1}”+alpha3+“{1}”)(\\s*)([0-9]{1}”+alpha5+“{2}”),“i”);
pcexp.push(新的RegExp(“^(“+alpha1+“{1}”+alpha2+“{1}”+”?[0-9]{1}”+alpha4+“{1}”)(\\s*)([0-9]{1}”+alpha5+“{2}”),“i”);
pcexp.push(/^(GIR)(\s*)(0AA)$/i);
pcexp.push(/^(bfpo)(\s*)([0-9]{1,4})$/i);
pcexp.push(/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
pcexp.push(/^([A-Z]{4})(\s*)(1ZZ)$/i);
var postCode=toCheck;
var-valid=false;
对于(var i=0;i一般而言,这称为“客户端验证”
有几个正则表达式正在添加到数组pcexp
。for()
循环一次检查数组中的每个正则表达式,以查看postCode
是否与模式匹配
“IfpostCode
匹配当前正则表达式”是循环中的If()
语句所说的
if()
结尾的语句检查postCode
是否与循环中的模式匹配,从而将valid
设置为true。请提供指向这些示例来源的链接。上下文可能有助于我们理解问题。基于变量名,它看起来好像在尝试验证邮政编码并试图覆盖多种国际格式。这是英国邮政编码验证(在页面上搜索邮政编码)与@mellamokb相同