js 获取一个字符串包含指定的字符的个数，这段实现代码还不错，记录下^-^
var str = "hello,world! I have , here."; var result = str.match(/,/g) console.log(result); var size = (result || []).length console.log(size);
这段代码获取字符串里包含逗号的个数，打印结果：
[",", ","] 2