2018.5.30

.npmignore

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+/.idea
+/node_modules
+*.log
+package-lock.json

.npminstall.done

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+Wed May 30 2018 14:22:54 GMT+0800 (中国标准时间)

index.js

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+var utils = require('./utils');
+
+module.exports = function (source) {
+    if (!this.cacheable || !this.query) {
+        return source;
+    }
+    this.cacheable();
+
+    var query = Object.assign({},{
+        viewportWidth: 750,
+        viewportUnit: 'vw',
+        minPixelValue:1,
+        decimal:3
+    },utils.getQueryString(this.query));
+
+    var matchPXExp = /([0-9.]+px)([;,| |}|'|"\)\r|\n])/g;
+
+    return source.replace(matchPXExp, function (match, m1, m2) {
+        var pixels = parseFloat(m1.slice(0, m1.length - 2));
+        if (pixels <= query.minPixelValue) {
+            return match;
+        }
+        return utils.createPxReplace(pixels, query.viewportWidth, query.decimal, query.viewportUnit) + m2;
+    });
+
+};

package.json

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+{
+  "name": "webpack-px2vw-loader",
+  "version": "1.0.0",
+  "description": "transform px to vw",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node index"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ashleygwilliams/my_package.git"
+  },
+  "author": "herorest",
+  "license": "ISC"
+}

utils.js

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+var util = require('util');
+
+var utils = {
+    createPxReplace : function(pixels, viewportSize, unitPrecision, viewportUnit) {
+        return (pixels / viewportSize * 100).toFixed(unitPrecision) + viewportUnit;
+    },
+
+    getQueryString : function(query){
+        if(!query) {
+             return {};
+        }
+        if(typeof query !== "string" && typeof query !== 'object') {
+    		util.error('query need use json type');
+    		return {};
+    	}
+        if(typeof query === "string" && query.substr(0, 1) === "{" && query.substr(-1) === "}"){
+            return JSON.parse(query);
+        }else{
+    		return query;
+        }
+    }
+}
+
+module.exports = utils;