js变量名中的数字用另一个变量替换怎么实现

Posted 2023-05-17

[javascript]

var test=\' colkey: "col", colsinfo: "NameList" \'

var test=\' colkey: "col", colsinfo: "NameList" \'

2.把文本转化为对象

[javascript]

var test=\' colkey: "col", colsinfo: "NameList" \'

var obj2=eval("("+test+")");

alert(obj2.colsinfo);

var test=\' colkey: "col", colsinfo: "NameList" \'

var obj2=eval("("+test+")");

alert(obj2.colsinfo);

3.把文本转化为数组

[javascript]

var test=\'["colkey", "col", "colsinfo","NameList" ]\'

var obj2=eval("("+test+")");

alert(obj2.length); 参考技术A var x="var a1";
var b="zz";
x.replace(/[0-9]1/,b);
eval(x); 参考技术B var a="a123",b="b";

a.replace(/[0-9]1/,b)

PHP变量名中的变量

Create variable named PHP variables. Having dynamically named variables can be helpful when dealing with loops and arrays. For example instead of having seven if () statements for handling seven individual days of the week, you could reduce it to one if statement by doing a loop with seven iterations and dynamically create your variable names.

// create fifty (50) variable named variables named my_var1, my_var2...
$name = "my_var";
 
for ($i = 0; $i < 50; $i++)
{
 
${$name.$i} = rand();
 
}
 
echo $my_var3;
 
 
// slightly more complex example to create a variably named array w/concatenation
$name = "my_var";
 
for ($i = 1; $i <=5; ++$i)
   ${$name . $i . '_arr'} = rand();
 
echo $my_var2_arr;