How to convert a string to a number using JavaScript?

Q

✍: Guest

A

You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times.

parseInt("100") ==> 100

parseFloat("98.6") ==> 98.6

parseFloat("98.6 is a common temperature.") ==> 98.6 

parseInt("aa") ==> Nan //Not a Number

parseInt("aa",16) ==> 170 //you can supply a radix or base

2011-06-21, 3812👍, 0💬

The definition for test schedule
The definition for test schedule... Test schedule, should identify a test schedule that clearly defines when all testing is expected to occur—This schedule may be included in the project schedule 2011-06-02, 4856👍, 0💬

How to set the cursor to wait?
How to set the cursor to wait? In theory, we should cache the current state of the cursor and then put it back to its original state. document.body.style.cursor = 'wait'; //do something interesting and time consuming document.body.style.cursor = 'auto'; 2011-06-07, 4683👍, 0💬

How to reload the current page
How to reload the current page window.location.reload(true); 2011-06-14, 4382👍, 0💬

General technical question
What is the difference between Java and C++? What is the advantage of each of them? Java does not support typedefs, defines, or a preprocessor. Without a preprocessor, there are no provisions for including header files. Since Java does not have a preprocessor there is no concept of #define macros or... 2011-06-28, 4156👍, 0💬

What's the Date object using JavaScript?
What's the Date object using JavaScript? Time inside a date object is stored as milliseconds since Jan 1, 1970. new Date(06,01,02) // produces "Fri Feb 02 1906 00:00:00 GMT-0600 (Central Standard Time)" new Date(06,01,02).toLocaleString( )// produces "Friday, February 02, 1906 00:00:00" new Date(06,... 2011-07-05, 3834👍, 0💬

How to convert numbers to strings using JavaScript?
How to convert numbers to strings using JavaScript? You can prepend the number with an empty string var mystring = ""+myinteger; or var mystring = myinteger.toString(); You can specify a base for the conversion, var myinteger = 14; var mystring = myinteger.toString(16); mystring will be "e". 2011-06-21, 3822👍, 0💬

How to convert a string to a number using JavaScript?
How to convert a string to a number using JavaScript? You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times. parseInt("100") ==> 100 parseFloat("98.6") ==> 98.6 parseFloat("98.6 ... 2011-06-21, 3813👍, 0💬

How to test for bad numbers using JavaScript?
How to test for bad numbers using JavaScript? The global method, "isNaN()" can tell if a number has gone bad. var temperature = parseFloat(myTemperatureWidget .value);if(!isNaN(temperature)) { alert("Please enter a valid temperature."); } 2011-06-28, 3687👍, 0💬

What's Math Constants and Functions using JavaScript?
What's Math Constants and Functions using JavaScript? The Math object contains useful constants such as Math.PI, Math.E Math also has a zillion helpful functions. Math.abs(value); //absolute value Math.max(value1, value2); //find the largest Math.random() //generate a decimal number between 0 and 1 ... 2011-07-05, 3609👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.