Class 操作
/**
* @file 简单实现对类名的操作，参考 jQuery 实现
* @author wind-stone@qq.com
* @date 2017-01-16 15:00
*/
var rnothtmlwhite = /[^\x20\t\r\n\f]+/g;
function getClass(elem) {
return (elem.getAttribute && elem.getAttribute('class')) || '';
}
function stripAndCollapse(value) {
var tokens = value.match(rnothtmlwhite) || [];
return tokens.join(' ');
}
module.exports = {
addClass: function(elem, value) {
var currentValue, currentClasses;
var i, newClass, newClasses;
var finalValue;
if (typeof value === 'string' && value) {
newClasses = value.match(rnothtmlwhite) || [];
currentValue = getClass(elem);
currentClasses =
elem.nodeType === 1 &&
' ' + stripAndCollapse(currentValue) + ' ';
if (currentClasses) {
i = 0;
while ((newClass = newClasses[i++])) {
if (currentClasses.indexOf(' ' + newClass + ' ') < 0) {
currentClasses += newClass + ' ';
}
}
finalValue = stripAndCollapse(currentClasses);
if (finalValue !== currentValue) {
elem.setAttribute('class', finalValue);
}
}
}
},
removeClass: function(elem, value) {
var currentValue, currentClasses;
var i, newClass, newClasses;
var finalValue;
if (typeof value === 'string' && value) {
newClasses = value.match(rnothtmlwhite) || [];
currentValue = getClass(elem);
currentClasses =
elem.nodeType === 1 &&
' ' + stripAndCollapse(currentValue) + ' ';
if (currentClasses) {
i = 0;
while ((newClass = newClasses[i++])) {
// 如果存在多个同名类名，则一起删除
while (currentClasses.indexOf(' ' + newClass + ' ') > -1) {
currentClasses = currentClasses.replace(
' ' + newClass + ' ',
' '
);
}
}
finalValue = stripAndCollapse(currentClasses);
if (finalValue !== currentValue) {
elem.setAttribute('class', finalValue);
}
}
}
},
hasClass: function(elem, value) {
var className = ' ' + value + ' ';
if (
elem.nodeType === 1 &&
(' ' + stripAndCollapse(getClass(elem)) + ' ').indexOf(className) >
-1
) {
return true;
}
return false;
}
};
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