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老式浏览器不兼容解决方案

老式浏览器不兼容解决方案

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        // Console-polyfill. MIT license.
        // https://github.com/paulmillr/console-polyfill
        // Make it safe to do console.log() always.
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            global.console = global.console || {};
            var con = global.console;
            var prop, method;
            var empty = {};
            var dummy = function() {};
            var properties = 'memory'.split(',');
            var methods = ('assert,clear,count,debug,dir,dirxml,error,exception,group,' +
            'groupCollapsed,groupEnd,info,log,markTimeline,profile,profiles,profileEnd,' +
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