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<script>
//把“今今今天晚晚晚晚晚晚上吃吃吃吃吃吃鸡”字符串换成单字的形式，即“今天晚上吃鸡”
//replace() //默认只替换一次，加g全部替换。(d)1 == $1
var str = '今今今天晚晚晚晚晚晚上吃吃吃吃吃吃鸡';
var result = str.replace(/([u4e00-u9fa5])1*/g, '$1');
//var result = str.replace(/([u4e00-u9fa5])1+/g, '$1');
console.log(result);
</script>
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