How to convert javascript string to boolean value

You can use Boolean() in js to convert a string into a Boolean value, and the syntax format is "Boolean (value to be converted into a Boolean value);". If the argument is omitted or set to 0, -0, null, "", false, undefined, or NaN, the object returns false; otherwise, true.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Boolean(); If the parameters are 0, null and no parameters, it returns false; if there are parameters, it returns true.

Boolean("");  //输出为：false
Boolean(null);  //输出为：false
Boolean(0);  //输出为：false 
Boolean("hi");  //输出为：true
Boolean(100);  //输出为：true
Boolean(new  Object());  //输出为：true

Boolean objects represent two values: "true" or "false".

Syntax

Boolean(value);		//转换函数

Parameters

Parameter value The value stored by the Boolean object or the value to be converted into a Boolean value.

Return value

When called as a constructor (with operator new), Boolean() will convert its argument to a Boolean value and return a Boolean containing that value Boolean object.

If called as a function (without operator new), Boolean() will only convert its argument to a primitive Boolean value and return this value.

Note: If the value parameter is omitted, or is set to 0, -0, null, "", false, undefined, or NaN, the object is set to false. Otherwise set to true (even if the value argument is the string "false").

[Recommended learning: javascript advanced tutorial]

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