javascript - 比较 Javascript 中的两个正则表达式并得到奇怪的结果

Question

有人可以解释一下 JavaScript 中这种奇怪的行为吗？当我使用 match() 方法进行比较时，我没有得到预期的结果。

var mat_1 = "wpawn";
var mat_2 = "wRook";

//compare both; do they have the same first letter? 

alert(mat_1.match(/^\w/) + " seems equal to " + mat_2.match(/^\w/));
if (mat_1.match(/^\w/) === mat_2.match(/^\w/)) {
    alert("They are really equal")
}

//another approach

if (mat_1[0] === mat_2[0]) {
    alert("Yes! Equals")
} 

Answer 1

match 生成一个数组。您确实应该使用数组比较函数，但为了简单演示，请尝试此操作 - 选择并比较第一个匹配值。所有 3 个警报均被触发:

var mat_1 = "wpawn";
var mat_2 = "wRook";

//compare both; do they have the same first letter? 

alert(mat_1.match(/^\w/)+" seems equal to "+mat_2.match(/^\w/));
if(mat_1.match(/^\w/)[0] === mat_2.match(/^\w/)[0]){alert("They are really equal")}

//another approach

if(mat_1[0] === mat_2[0]){alert("Yes! Equals")}