论坑爹的js中的空数组问题

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作为处级前台写手,定义 var tt = []; 作为全局变量,但是发现你使用的时候不对他进行清空的话,他会在以前旧数据的基础上进行叠加,例如  

var tt = [];

function t1(){

    tt.push('1');

}

function t2(){

    tt.push("2");

}

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