本文介绍了如何在 Javascript 中追加或连接字符串?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
所以我试图添加到一个字符串，它显示为空.
So I'm trying to add to a string and it shows up as empty.
var DNA = "TAG";
var mRNA = "";
m_RNA()
function check(a, b, string) {
if (string = a) {
mRNA.concat(b);
}
}
function m_RNA(){
//console.log(DNA)
for (var i = 0; i < DNA.length; i++) {
console.log("Checking: " + DNA[i]);
check("T", "A", DNA[i]);
check("A", "U", DNA[i]);
check("C", "G", DNA[i]);
check("G", "C", DNA[i]);
console.log(mRNA);
}
}
它应该在控制台中显示 AUC，但它只是空白.顺便说一下，这是通过 Firefox 实现的.
Its supposed to show AUC in the console but its just blank. This is through firefox by the way.
推荐答案
mRNA.concat(b); 不会改变字符串，它只会计算值.您需要mRNA = mRNA.concat(b)(或mRNA = mRNA + b)来改变mRNA的值.
mRNA.concat(b); doesn't mutate the string, it only computes the value. You need tomRNA = mRNA.concat(b) (or mRNA = mRNA + b) to change the value of mRNA.
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