08-27-周三_17-09-29

node_modules/less/lib/less-browser/browser.js

@@ -0,0 +1,64 @@
+var utils = require("./utils");
+module.exports = {
+    createCSS: function (document, styles, sheet) {
+        // Strip the query-string
+        var href = sheet.href || '';
+
+        // If there is no title set, use the filename, minus the extension
+        var id = 'less:' + (sheet.title || utils.extractId(href));
+
+        // If this has already been inserted into the DOM, we may need to replace it
+        var oldStyleNode = document.getElementById(id);
+        var keepOldStyleNode = false;
+
+        // Create a new stylesheet node for insertion or (if necessary) replacement
+        var styleNode = document.createElement('style');
+        styleNode.setAttribute('type', 'text/css');
+        if (sheet.media) {
+            styleNode.setAttribute('media', sheet.media);
+        }
+        styleNode.id = id;
+
+        if (!styleNode.styleSheet) {
+            styleNode.appendChild(document.createTextNode(styles));
+
+            // If new contents match contents of oldStyleNode, don't replace oldStyleNode
+            keepOldStyleNode = (oldStyleNode !== null && oldStyleNode.childNodes.length > 0 && styleNode.childNodes.length > 0 &&
+                oldStyleNode.firstChild.nodeValue === styleNode.firstChild.nodeValue);
+        }
+
+        var head = document.getElementsByTagName('head')[0];
+
+        // If there is no oldStyleNode, just append; otherwise, only append if we need
+        // to replace oldStyleNode with an updated stylesheet
+        if (oldStyleNode === null || keepOldStyleNode === false) {
+            var nextEl = sheet && sheet.nextSibling || null;
+            if (nextEl) {
+                nextEl.parentNode.insertBefore(styleNode, nextEl);
+            } else {
+                head.appendChild(styleNode);
+            }
+        }
+        if (oldStyleNode && keepOldStyleNode === false) {
+            oldStyleNode.parentNode.removeChild(oldStyleNode);
+        }
+
+        // For IE.
+        // This needs to happen *after* the style element is added to the DOM, otherwise IE 7 and 8 may crash.
+        // See http://social.msdn.microsoft.com/Forums/en-US/7e081b65-878a-4c22-8e68-c10d39c2ed32/internet-explorer-crashes-appending-style-element-to-head
+        if (styleNode.styleSheet) {
+            try {
+                styleNode.styleSheet.cssText = styles;
+            } catch (e) {
+                throw new Error("Couldn't reassign styleSheet.cssText.");
+            }
+        }
+    },
+    currentScript: function(window) {
+        var document = window.document;
+        return document.currentScript || (function() {
+            var scripts = document.getElementsByTagName("script");
+            return scripts[scripts.length - 1];
+        })();
+    }
+};