js驗證密碼長度須在8到20位之間，並至少包含以下4種類型中的3種：英文大寫、英文小寫、數字及符號

也就是多幾個條件語句，程式碼如下:

checkpassword = function(v){

var numasc = 0;

var charasc = 0;

var otherasc = 0;

if(0==v.length){

return "密碼不能為空";

}else if(v.length<8||v.length>12){

return "密碼至少8個字元,最多12個字元";

}else{

for (var i = 0; i < v.length; i++) {

var asciiNumber = v.substr(i, 1).charCodeAt();

if (asciiNumber >= 48 && asciiNumber <= 57) {

numasc += 1;

}

if ((asciiNumber >= 65 && asciiNumber <= 90)||(asciiNumber >= 97 && asciiNumber <= 122)) {

charasc += 1;

} .

if ((asciiNumber >= 33 && asciiNumber <= 47)||(asciiNumber >= 58 && asciiNumber <= 64)||(asciiNumber >= 91 && asciiNumber <= 96)||(asciiNumber >= 123 && asciiNumber <= 126)) {

otherasc += 1;

}

}

if(0==numasc) {

return "密碼必須含有數字";

}else if(0==charasc){

return "密碼必須含有字母";

}else if(0==otherasc){

return "密碼必須含有特殊字元";

}else{

return true;

}

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