示例--->
这是输入值--->“ 5ab98c5d9e1fgh95i9klmn15”
预期输出---> ........ 9e1fgh95i9klmn15
const text_truncate = function(str, length, start) {
if (length == null) {
length = 100;
}
if (start == null) {
start = '...';
}
if (str.length > length) {
return str.substring(0, length + start.length) + start;
} else {
return str;
}
};
text_truncate("5ab98c5d9e1fgh95i9klmn15", 8)
但是我得到---> 5ab98c5d9e1 ...
您应将起始索引更改为长度以从左侧截断。
return str.substring(length + start);