//replace all
var str:String="AAABBBCCCAAA";
str=str.split("AAA").join("DDD");
//结果str为：DDDBBBCCCDDD
//replace first
var str:String="AAABBBCCCAAA";
str=str.replace("AAA","DDD");
//结果str为：DDDBBBCCCAAA
//replace all
var str:String="AAABBBCCCAAA";
str=str.split("AAA").join("DDD");
//结果str为：DDDBBBCCCDDD
//replace first
var str:String="AAABBBCCCAAA";
str=str.replace("AAA","DDD");
//结果str为：DDDBBBCCCAAA
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