用js如何去掉最后一个字符和后面的内容，我知道一个笨办法，要多谢两行代码。我想知道有没有简单的 如何在js中去掉字符串最后一位的逗号
JS\u5982\u4f55\u53bb\u9664\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\uff08\u6307\u5b9a\uff09\u6ca1\u6709\uff0c\u9700\u8981\u81ea\u5df1\u5199\u5224\u5b9a\u65b9\u6cd5
function a(){ var a="app/app/app/"; if(a.substr(a.length-1,a.length)=="/") { a=a.substr(0,a.length-1); } alert(a); }
\u5728js\u4e2d\u53bb\u6389\u5b57\u7b26\u4e32\u6700\u540e\u4e00\u4f4d\u7684\u9017\u53f7\uff0c\u5c31\u662f\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\uff0c\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u4e5f\u5f88\u7075\u6d3b\uff0c\u8fd9\u91cc\u4ecb\u7ecd\u4e00\u79cd\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\u7684\u4ee3\u7801\uff0c\u540c\u65f6\u5f53\u9017\u53f7\u4e0d\u662f\u5728\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u65f6\u4e5f\u53ef\u4ee5\u4f7f\u7528\uff1a
var string = '123,456,789';
var lastIndex = s.lastIndexOf(\u201c,\u201d);
if (lastIndex > -1) {
string = s.substring(0, lastIndex) + s.substring(lastIndex + 1, s.length);
alert(string);
)
\u6269\u5c55\u8d44\u6599\uff1a
js\u7684\u57fa\u672c\u7279\u70b9\uff1a
1\u3001\u662f\u4e00\u79cd\u89e3\u91ca\u6027\u811a\u672c\u8bed\u8a00\uff08\u4ee3\u7801\u4e0d\u8fdb\u884c\u9884\u7f16\u8bd1\uff09\u3002
2\u3001\u4e3b\u8981\u7528\u6765\u5411HTML\uff08\u6807\u51c6\u901a\u7528\u6807\u8bb0\u8bed\u8a00\u4e0b\u7684\u4e00\u4e2a\u5e94\u7528\uff09\u9875\u9762\u6dfb\u52a0\u4ea4\u4e92\u884c\u4e3a\u3002
3\u3001\u53ef\u4ee5\u76f4\u63a5\u5d4c\u5165HTML\u9875\u9762\uff0c\u4f46\u5199\u6210\u5355\u72ec\u7684js\u6587\u4ef6\u6709\u5229\u4e8e\u7ed3\u6784\u548c\u884c\u4e3a\u7684\u5206\u79bb\u3002
4\u3001\u8de8\u5e73\u53f0\u7279\u6027\uff0c\u5728\u7edd\u5927\u591a\u6570\u6d4f\u89c8\u5668\u7684\u652f\u6301\u4e0b\uff0c\u53ef\u4ee5\u5728\u591a\u79cd\u5e73\u53f0\u4e0b\u8fd0\u884c\uff08\u5982Windows\u3001Linux\u3001Mac\u3001Android\u3001iOS\u7b49\uff09\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1\u2014\u2014js
可以使用js的substr()函数，如：
window.onload = function(){
var a = "abcd2-1-2-3-1-2-3";
var b = a.substr(0,a.length-2);
alert(b);
}
用slice 用法 a.slice(0,15)
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