我在 Visual Studios 2012 中有一个 JavaScript 解析器插件，它在这段代码的第 30 行抛出一个错误，这是 Bush 先生的 $.mask 片段的右大括号:
/*
Masked Input plugin for jQuery
Copyright (c) 2007-2013 Josh Bush (digitalbush.com)
Licensed under the MIT license (http://digitalbush.com/projects/masked-input-plugin/#license)
Version: 1.3.1
*/
(function($) {
function getPasteEvent() {
var el = document.createElement('input'),
name = 'onpaste';
el.setAttribute(name, '');
return (typeof el[name] === 'function') ? 'paste': 'input';
}
var pasteEventName = getPasteEvent() + ".mask",
ua = navigator.userAgent,
iPhone = /iphone/i.test(ua),
android = /android/i.test(ua),
caretTimeoutId;
$.mask = {
//Predefined character definitions
definitions: {
'9': "[0-9]",
'a': "[A-Za-z]",
'*': "[A-Za-z0-9]"
},
dataName: "rawMaskFn",
placeholder: '_',
};
$.fn.extend({
//Helper Function for Caret positioning
caret: function(begin, end) {
var range;
if (this.length === 0 || this.is(":hidden")) {
return;
}
if (typeof begin == 'number') {
end = (typeof end === 'number') ? end: begin;
return this.each(function() {
if (this.setSelectionRange) {
this.setSelectionRange(begin, end);
} else if (this.createTextRange) {
range = this.createTextRange();
range.collapse(true);
range.moveEnd('character', end);
range.moveStart('character', begin);
range.select();
}
});
} else {
if (this[0].setSelectionRange) {
begin = this[0].selectionStart;
end = this[0].selectionEnd;
} else if (document.selection && document.selection.createRange) {
range = document.selection.createRange();
begin = 0 - range.duplicate().moveStart('character', -100000);
end = begin + range.text.length;
}
return {
begin: begin,
end: end
};
}
},
unmask: function() {
return this.trigger("unmask");
},
mask: function(mask, settings) {
var input,
defs,
tests,
partialPosition,
firstNonMaskPos,
len;
if (!mask && this.length > 0) {
input = $(this[0]);
return input.data($.mask.dataName)();
}
settings = $.extend({
placeholder: $.mask.placeholder,
// Load default placeholder
completed: null
}, settings);
defs = $.mask.definitions;
tests = [];
partialPosition = len = mask.length;
firstNonMaskPos = null;
$.each(mask.split(""), function(i, c) {
if (c == '?') {
len--;
partialPosition = i;
} else if (defs[c]) {
tests.push(new RegExp(defs[c]));
if (firstNonMaskPos === null) {
firstNonMaskPos = tests.length - 1;
}
} else {
tests.push(null);
}
});
return this.trigger("unmask").each(function() {
var input = $(this),
buffer = $.map(mask.split(""), function(c, i) {
if (c != '?') {
return defs[c] ? settings.placeholder: c;
}
}),
focusText = input.val();
function seekNext(pos) {
while (++pos < len && !tests[pos]);
return pos;
}
function seekPrev(pos) {
while (--pos >= 0 && !tests[pos]);
return pos;
}
function shiftL(begin, end) {
var i,
j;
if (begin < 0) {
return;
}
for (i = begin, j = seekNext(end); i < len; i++) {
if (tests[i]) {
if (j < len && tests[i].test(buffer[j])) {
buffer[i] = buffer[j];
buffer[j] = settings.placeholder;
} else {
break;
}
j = seekNext(j);
}
}
writeBuffer();
input.caret(Math.max(firstNonMaskPos, begin));
}
function shiftR(pos) {
var i,
c,
j,
t;
for (i = pos, c = settings.placeholder; i < len; i++) {
if (tests[i]) {
j = seekNext(i);
t = buffer[i];
buffer[i] = c;
if (j < len && tests[j].test(t)) {
c = t;
} else {
break;
}
}
}
}
function keydownEvent(e) {
var k = e.which,
pos,
begin,
end;
//backspace, delete, and escape get special treatment
if (k === 8 || k === 46 || (iPhone && k === 127)) {
pos = input.caret();
begin = pos.begin;
end = pos.end;
if (end - begin === 0) {
begin = k !== 46 ? seekPrev(begin) : (end = seekNext(begin - 1));
end = k === 46 ? seekNext(end) : end;
}
clearBuffer(begin, end);
shiftL(begin, end - 1);
e.preventDefault();
} else if (k == 27) {
//escape
input.val(focusText);
input.caret(0, checkVal());
e.preventDefault();
}
}
function keypressEvent(e) {
var k = e.which,
pos = input.caret(),
p,
c,
next;
if (e.ctrlKey || e.altKey || e.metaKey || k < 32) {
//Ignore
return;
} else if (k) {
if (pos.end - pos.begin !== 0) {
clearBuffer(pos.begin, pos.end);
shiftL(pos.begin, pos.end - 1);
}
p = seekNext(pos.begin - 1);
if (p < len) {
c = String.fromCharCode(k);
if (tests[p].test(c)) {
shiftR(p);
buffer[p] = c;
writeBuffer();
next = seekNext(p);
if (android) {
setTimeout($.proxy($.fn.caret, input, next), 0);
} else {
input.caret(next);
}
if (settings.completed && next >= len) {
settings.completed.call(input);
}
}
}
e.preventDefault();
}
}
function clearBuffer(start, end) {
var i;
for (i = start; i < end && i < len; i++) {
if (tests[i]) {
buffer[i] = settings.placeholder;
}
}
}
function writeBuffer() {
input.val(buffer.join(''));
}
function checkVal(allow) {
//try to place characters where they belong
var test = input.val(),
lastMatch = -1,
i,
c;
for (i = 0, pos = 0; i < len; i++) {
if (tests[i]) {
buffer[i] = settings.placeholder;
while (pos++<test.length) {
c = test.charAt(pos - 1);
if (tests[i].test(c)) {
buffer[i] = c;
lastMatch = i;
break;
}
}
if (pos > test.length) {
break;
}
} else if (buffer[i] === test.charAt(pos) && i !== partialPosition) {
pos++;
lastMatch = i;
}
}
if (allow) {
writeBuffer();
} else if (lastMatch + 1 < partialPosition) {
input.val("");
clearBuffer(0, len);
} else {
writeBuffer();
input.val(input.val().substring(0, lastMatch + 1));
}
return (partialPosition ? i: firstNonMaskPos);
}
input.data($.mask.dataName, function() {
return $.map(buffer, function(c, i) {
return tests[i] && c != settings.placeholder ? c: null;
}).join('');
});
if (!input.attr("readonly"))
input.one("unmask", function() {
input.unbind(".mask").removeData($.mask.dataName);
}).bind("focus.mask", function() {
clearTimeout(caretTimeoutId);
var pos,
moveCaret;
focusText = input.val();
pos = checkVal();
caretTimeoutId = setTimeout(function() {
writeBuffer();
if (pos == mask.length) {
input.caret(0, pos);
} else {
input.caret(pos);
}
}, 10);
}).bind("blur.mask", function() {
checkVal();
if (input.val() != focusText)
input.change();
}).bind("keydown.mask", keydownEvent).bind("keypress.mask", keypressEvent).bind(pasteEventName, function() {
setTimeout(function() {
var pos = checkVal(true);
input.caret(pos);
if (settings.completed && pos == input.val().length)
settings.completed.call(input);
}, 0);
});
checkVal();
//Perform initial check for existing values
});
}
});
})(jQuery);
我对 JS 和 jQuery 还很陌生，谁能告诉我为什么？我是在调查掩码代码为何在 ie8 中导致一些错误时到达这里的。
同样，我的解析器不喜欢这个 block 的结束 curl :
$.mask = {
//Predefined character definitions
definitions: {
'9': "[0-9]",
'a': "[A-Za-z]",
'*': "[A-Za-z0-9]"
},
dataName: "rawMaskFn",
placeholder: '_',
};
任何帮助将不胜感激!
最佳答案
也许是因为 placeholder: ... 行后面多了一个逗号？
关于javascript - 为什么此掩码代码会出现 JavaScript 解析器错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16547853/