window.execScript的兼容性写法

var globalEval = (function(){
    
    var core_rnotwhite = /\S/;

    if(window.execScript){
        return function(data){
            data && core_rnotwhite.test(data) && window.execScript(data);
        };
    }else{
        return function(data){
            data && core_rnotwhite.test(data) && window[ "eval" ].call( window, data );
        };
    }
})();