js获取五星级评分字符串

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var rate = 1;
"★★★★★☆☆☆☆☆".slice(5-rate,10-rate);
"★☆☆☆☆"
rate = 2;
"★★★★★☆☆☆☆☆".slice(5-rate,10-rate);
"★★☆☆☆"