如何在JavaScript中检查字符串长度？

Question

How can I check the length of in String in JavaScript? Here is a small code example:

if(value != null && value != "" && value.length !== 10 && !value.match(/^\d*$/)){

   // do something

}

The expression 'value.length !== 10' doesn´t work. A String must contain at least 10 characters. How can I solve this problem?

Answer 1

可以使用适当的正则表达式\\d{10,}代替test来match 。

if (value && /^\d{10,}$/.test(value.trim()))

Answer 2

To Get the string length of a value for example:

var value="This is a string";
var string_length=value.length;
/*The string length will result to 16*/

Hope this helps

Answer 3

var regex = new RegExp(/^\d*$/),
    value = $.trim("1234567890");

if (value.length >= 10 && regex.exec(value)) {
   // correct
} else {
   // incorrect
}