JavaScript中变量声明效率问题

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 1 var theString1 = "字符串1";

 var theString2 = "字符串1";

 var theString3 = "字符串1";

 var theString = {

 　　theString1: "字符串1",

 　　theString2: "字符串1",

 　　theString3: "字符串1",

 }

 var time1 = new Date();

 for(var i =0; i<100000000; i++){

 　　var thisString = theString1 + theString2 + theString3;

 }

 var time2 = new Date();

 console.log(" 变量(time2-time1)--->",(time2-time1));

 var time3 = new Date();

 for(var i =0; i<100000000; i++){

 　　var thisString = theString.theString1 + theString.theString2 + theString.theString3;

 }

 var time4 = new Date();

 console.log(" 变量(time4-time3)--->",(time4-time3));

 //输出结果:

 变量(time2-time1)---> 1387

 变量(time4-time3)---> 1465