bc518174
 王天杨
提交两个项目文件
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import { getNonce } from 'get-nonce';
function makeStyleTag() {
if (!document)
return null;
var tag = document.createElement('style');
tag.type = 'text/css';
var nonce = getNonce();
if (nonce) {
tag.setAttribute('nonce', nonce);
}
return tag;
}
function injectStyles(tag, css) {
// @ts-ignore
if (tag.styleSheet) {
// @ts-ignore
tag.styleSheet.cssText = css;
}
else {
tag.appendChild(document.createTextNode(css));
}
}
function insertStyleTag(tag) {
var head = document.head || document.getElementsByTagName('head')[0];
head.appendChild(tag);
}
export var stylesheetSingleton = function () {
var counter = 0;
var stylesheet = null;
return {
add: function (style) {
if (counter == 0) {
if ((stylesheet = makeStyleTag())) {
injectStyles(stylesheet, style);
insertStyleTag(stylesheet);
}
}
counter++;
},
remove: function () {
counter--;
if (!counter && stylesheet) {
stylesheet.parentNode && stylesheet.parentNode.removeChild(stylesheet);
stylesheet = null;
}
},
};
};
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