eval 函数 代替函数
eval()函数 (eval() function)
eval() functionis a predefined global function in JavaScript and it is used to evaluate (execute) an expression, which is passed to the function as a parameter. It can also evaluate any JavaScript code.
eval()函数是JavaScript中预定义的全局函数，用于评估(执行)表达式，该表达式作为参数传递给该函数。 它还可以评估任何JavaScript代码。
Syntax:
句法：
eval(expression);
Here, expression is the JavaScript code or any expression having values or variables.
此处， 表达式是JavaScript代码或具有值或变量的任何表达式。
Example:
例：
<html><head><title>JavaScipt Example</title></head><body><script>var num1 = 100;var num2 = 200;var num3 = eval("num1 + num2"); //add num1 and num2var num4 = eval("num3 + 100"); //add num3 and 100var str = eval("num4.toString(16)"); //convert num4 value to hexdocument.write("num3: " + num3 + "<br>");document.write("num4: " + num4 + "<br>");document.write("str: " + str + "<br>");</script></body></html>
Output
输出量
num3: 300num4: 400str: 190
翻译自: /code-snippets/eval-function-with-example-in-javascript.aspx
eval 函数 代替函数
